Crossing-over occurs
a. during prophase 2.
c. during prophase I.
b. during fertilization.
d. at the centromere

Answers

Answer 1
C. Prophase 1 crossing over occurs during prophase 1 of meiosis.
Answer 2
Answer : prophase I

Internets prove: Crossing over occurs only during prophase I.
The complex that temporarily forms between homologous chromosomes is only present in prophase I, making this the only opportunity the cell has to move DNA segments between the homologous pair.

Related Questions

i know its not a study question but if deaf peopke dont know what people sound like how do think in their head

Answers

Answer:

deaf people can think and know thier voice when they are thinking so they don't rlly need to imagine peoples voices they know what people would soundlike but some people aren't born deaf and know how people sound like

Explanation:

Answer:

Well.. they have their own voice that they can be able to hear in their head... it's given automatically, the voice they hear when they talk. It's not something where the first voice you hear in your life, is the one you hear for the rest of ya life..

Explanation:

Hope this helped :D Have a great day

Which of the following are sources of extra nutrients that can cause algae to overgrow in water due to HUMAN activity? CAREFULLY select all options that apply

dissolved oxygen in water

treated waste water

viruses

combined sewage overflow (CSO)

fertilizers

cleaning products

dog poop on the streets of NYC

water running over rocks

(This is 7th grade sciencve).

Answers

Answer:

Too much nitrogen and phosphorus in the water causes algae to grow faster than ecosystems can handle. Significant increases in algae harm water quality, food resources and habitats, and decrease the oxygen that fish and other aquatic life need to survive.

hopes this helpssssssssssssssssssssssssssssssssssss

What kind of bacteria are able to change pure nitrogen into ammonia compounds?
Group of answer choices

nitrifying

decomposing

nitrogen-fixing

denitrifying

Answers

Answer:

the anwer is nitrifying fixing as given in your text .

Explanation:

Decomposers also produce ammonia by converting animal waste and dead plants and animals into organic and inorganic materials, including ammonia.

Nitrifying I hope this helps

Need help right nowwww!!

Answers

C :)))))))))))))))...... yu welcome
It would be C.what happens to the substrate as temperature rises

Hope this helps

Have a great day/night

Which structure of the lymphatic system functions as the site of development of T lymphocytes during childhood and the preteen years, but is replaced by fat as an individual grows older?
thymus
bone marrow
spleen
adenoids

Answers

Answer: thymus

Explanation: T cells adapt in the immune system just like the thymus

Answer:

Thymus

Explanation:

I don't actually know so I'm sorry if it is wrong

Have a great day!!!!!

Which of the following is a synthetic material?
a. wood
b. plastic
c. wool
d. coal










Answers

Plastic
Hope this helps !

Answer:

Your answer is B) Plastic.

Explanation:

"Synthetic" just means "human-made" or "artificial".

A), C), and D) can all be found in nature, and aren't made by humans.

What is the function of mitochondria in prokaryotes?

Answers

Answer:

Prokaryotes lack mitochondria.

Of all of the energy given off by the Sun directed towards Earth, approximately only 50 percent of the energy penetrates directly to
the surface of Earth. What is the best explanation for what happens to the rest of the energy?

A) Energy is lost during while traveling through space.

B) Energy is reflected or absorbed by Earth's atmosphere.

C) Some of the energy is reflected back into space by the Moon.

D) Energy is lost through the process of overcoming the Sun's large gravitational force.

Answers

The answer is C) some of the energy is reflected back into space by the moon

Which human activity negatively affects the stability of the environment?

Answers

Answer:

Some human activities that cause damage (either directly or indirectly) to the environment on a global scale include population growth, overconsumption, overexploitation, pollution, and deforestation, to name but a few.

Explanation:

Brainliest?

Will give the brainiest! Please answer it correctly and thoughtfully. Please answer the first question with AT LEAST 2-3 sentences, while the last one can just be examples

1. Meiosis is two divisions of a reproductive cell’s nucleus. It occurs in a continuous series of steps. Compare AND contrast the steps of meiosis I to meiosis II. ​

2. Describe mutation. Give EXAMPLES where mutations could be harmful, beneficial, or neutral.​

Answers

Answer:

1. Both Meiosis I and II have the same number and arrangement of phases: prophase, metaphase, anaphase, and telophase. In meiosis II, these chromosomes are further separated into sister chromatids. Meiosis I includes crossing over or recombination of genetic material between chromosome pairs, while meiosis II does not.

2. Answer! A Mutation occurs when a DNA gene is damaged or changed in such a way as to alter the genetic message carried by that gene. The majority of mutations are neutral in their effects on the organisms in which they occur. Beneficial mutations may become more common through natural selection. Harmful mutations may cause genetic disorders or cancer. I hope it helps! :)

Will lactase, the enzyme that digested the ice cream's lactose, also work on the lactose found in cheese?

Answers

Answer:

Yes

Explanation:

This is because lactose found in any dairy product will always have the same molecular structure. The lactase enzyme breaks down lactose because of how it is structured, so it does not matter where the lactose comes from.

4. If we had a waxing crescent moon on December 3, what phase will be seeing on December
13 (10 days later)?

Answers

Answer:

Waxing gibbous

Explanation:

What does the lunar rover do?
O moves astronauts around
O gives air to astronauts
O makes space rocks

Answers

The answer is the first one

Moves astronauts around

Can someone please help ASAP

Answers

Answer:

I would say 2/4 or 3/4 sorry if its wrong

In C3 cycle one carbon compound is accepted by?

Answers

Answer:

The correct answer is - RuBP.

Explanation:

In calvin cycle or C3 cycle there is only one carbon compound present or enter in the cycle is carbon dioxide which is enters through stomata and move into stoma of chloroplast. It is the site of of the C3 cycle.

In calvin cycle energy used to reduce 3-phosphoglyceric acid to produce glyceraldehyde-3 phosphate which result in generation of the RuBP that accepts the CO2 from the air to attached with RuBISCO.

All planets in the solar system have surfaces that are made up of either one of two materials. What are the two materials?

Answers

Answer:

are made of rock, containing common minerals like feldspars and metals like magnesium and aluminum.

Explanation:

Which is most likely the last to form

Answers

where’s the photo ? or answer choices?

Can you tell me which go where?

Answers

Answer:

heredity goes to the first one

phenotype at the second one

Explanation:

4. Transcribe and Translate a Gene. How is mRNA different from DNA? (Hint read the side-bar on this page for help) What is the correct starting position for translation? Write the amino acids used to assemble your protein in the order below. Where does translation take place?​

Answers

The genes in DNA encode protein molecules, which are the "workhorses" of the cell, carrying out all the functions necessary for life. For example, enzymes, including those that metabolize nutrients and synthesize new cellular constituents, as well as DNA polymerases and other enzymes that make copies of DNA during cell division, are all proteins.

In the simplest sense, expressing a gene means manufacturing its corresponding protein, and this multilayered process has two major steps. In the first step, the information in DNA is transferred to a messenger RNA (mRNA) molecule by way of a process called transcription. During transcription, the DNA of a gene serves as a template for complementary base-pairing, and an enzyme called RNA polymerase II catalyzes the formation of a pre-mRNA molecule, which is then processed to form mature mRNA (1). The resulting mRNA is a single-stranded copy of the gene, which next must be translated into a protein molecule.

QUICK PLS

Body cells have
____ the number of chromosomes as sex cells.


a: 4times
b: one half
c: one fourth
d: twice

Answers

Answer:

Body cells have twice the number

Which component of a galaxy consists of tiny particles that look smoky or cloudy and can be found in the space between stars? A) Gas B) Stars C) Dust D)Sun

Answers

Answer: Gas

Explanation:

Look through the lesson lol i know your school

Nebulae are different luminous regions of the interstellar medium that can be made up of cosmic dust as well as ionized, neutral, or molecular hydrogen, hence option C is correct.

What is dust?

All the stuff between stars is referred to as interstellar matter by astronomers, and the complete collection of interstellar matter is referred to as the interstellar medium (ISM). Some interstellar material is gathered into massive clouds that are each referred to as a nebula.

Tiny pieces of solid matter drifting about in the region between stars make up cosmic dust. It's not like the dust you find in your home; instead, it has tiny particles that range in size from collections of just a few molecules to grains that are 0.1 mm in size.

Therefore, an interstellar medium can be made up of cosmic dust as well as ionized, neutral, or molecular hydrogen, hence option C is correct.

Learn more about the dust, here:

https://brainly.com/question/562915

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What is the difference between a molecule and a diagram of a molecule ?

Answers

Answer: The molecule itself is the actual thing present.

while the diagram explains what makes up a molecule or what it looks like structurally

Explanation:

Which is the most efficient way to avoid DNA mutations from UV radiation?
Avoid getting X-rays at the doctor’s office.
Avoid protective shields during X-rays.
Avoid UV radiation by wearing sunscreen.
Avoid UV radiation by using a tanning bed.

Answers

Answer:

Sunscreen is the best, and most efficient way to avoid DNA mutations. UV radiation causes thymine dimers in the DNA complex, so limiting UV radiation is key to avoiding DNA mutations.

Explanation:

The most efficient way to avoid DNA mutations from UV radiation is to avoid UV radiation by wearing sunscreen. Thus, the correct option is C.

What is DNA mutation?

DNA mutation may be defined as the process that induces sudden, stable, and inheritable changes in the genetic material of organisms through various factors.

The UV radiations are the most potent physical agent that induces DNA mutation. But in order to avoid such kinds of DNA mutations from UV radiation one must be required to be protected from such kinds of harmful radiation with the help of sunscreen.

The UV radiation induces DNA mutations by causing the dimerization of the thymine base, which significantly alters the whole sequence of genetic material.

Therefore, the most efficient way to avoid DNA mutations from UV radiation is to avoid UV radiation by wearing sunscreen. Thus, the correct option is C.

To learn more about DNA mutations, refer to the link:

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At which type of technonic plate boundary is a volcano least likely to occur​

Answers

Answer:  A

coz its just sliding one another

Hope it is correct

^_^

Give three differences between parenchyma and selerenchyma? ​

Answers

Answer:

Parenchyma cells have thin primary walls and usually remain alive after they become mature while Sclerenchyma cells have thick lignified secondary walls and often die when mature.

Parenchyma forms the "filler" tissue in the soft parts of plants while  Sclerenchyma provides the main structural support to a plant.

Parenchyma cells are usually loosely packed with large intercellular space while Sclerenchyma cells has no intercellular spaces between the cells.

Context: The quotation marks outside the words are the basis for comparison

Parenchyma: (1) “Found in” These type of cells are present in every soft part of the plant. (2) “Type of cell” Unspecialized and living cells. (3) “Cell shape” There are various shapes of the cells, but generally, they are isodiametric.

Sclerenchyma: (1) “Found in” it is found in mature parts of the plants or trees. (2) “Type of cell” specialized, matured and dead cells. (3) “Cell shape” Sclereids, elongated and fibre shape.

How can the health of a forest play a role in maintaining human health?

A. Forest can be a source of mining.

B. Forest provide pulp to make paper.

C. Medicines are made from forest species.

D. Forest provide numerous wildlife habitats.​

Answers

Answer:

C. medicine can be made from different sources in the forest

QUESTION: Which one of the following is likely to be most effective in reducing dental decay?

(a) Eating fibrous food, e.g. apples, after meals.
(b) Cutting down on sweets, biscuits etc. between meals. 
(c) Cleaning the teeth after meals and at night. 
(d) Using an antiseptic mouthwash.

help me plz​

Answers

Answer:

It is between B and C I am 99.999% Sure its C but you might wanna check :))))

Explanation:

which of the following correctly identifies the inheritance patterns arnoldo is observing?

Answers

the yellow allele is incompletely dominant...

Explanation:

The yellow allele is incompletely dominant.

What is Inheritance pattern?

Genetic variation distribution in families is characterized by inheritance patterns. Predicting disease risk in a patient's family requires an understanding of these patterns.

Conditions brought on by pathogenic variations in a single gene are referred to as monogenic or Mendelian conditions.

Depending on the pattern of inheritance, a gene may be influenced by either one or both alleles.

Therefore, The yellow allele is incompletely dominant.

To learn more about Inheritance, refer to the link:

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Atmospheric nitrogen, in its gaseous form, is useful to plants. *
True
False

Answers

Answer:

true

Explanation:

Answer:

False.

Explanation:

Atmospheric Nitrogen, in its gaseous form, is harmful to Plants and Animals.

Have a great day! (:

Overgrazing reduces grass cover and negatively impacts the soil health by reducing it's ability to hold water . How can Overgrazing be prevented and support a more sustainable use of grasslands ?
A. Allow developers to buy rachlands for housing .
B. practice moving confined cattle every few days
C. Allow unlimited animals to graze in a given area to reach carrying capacity.
D. practice grazing an area of land at the same stage of plant growth each year .​

Answers

Answer: C. Allow unlimited animals to graze in a given area to reach carrying capacity.

Explanation: I choose this as the answer because the animals grazing in the wrong parts be part of the reason the soil can't hold the water it needs, so allowing animals in a particular area that's less of a problem with Overgrazing would be helpful

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