1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
horrorfan [7]
3 years ago
12

Describe what happens during the process of crossing over

Biology
1 answer:
Zanzabum3 years ago
6 0

Answer:

crossing over, process in genetics by which the two chromosomes of a homologous pair exchange equal segments with each other. Crossing over occurs in the first division of meiosis . At that stage each chromosome has replicated into two strands called sister chromatids. The two homologous chromosomes of a pair synapse, or come together. While the chromosomes are synapsed, breaks occur at corresponding points in two of the non-sister chromatids, i.e., in one chromatid of each chromosome. Since the chromosomes are homologous, breaks at corresponding points mean that the segments that are broken off contain corresponding genes , i.e., alleles. The broken sections are then exchanged between the chromosomes to form complete new units, and each new recombined chromosome of the pair can go to a different daughter sex cell. Crossing over results in recombination of genes found on the same chromosome, called linked genes, that would otherwise always be transmitted together. Because the frequency of crossing over between any two linked genes is proportional to the chromosomal distance between them, crossing over frequencies are used to construct genetic, or linkage, maps of genes on chromosomes. Mutations , temperature changes, and radiation all affect crossing over frequency. Under the microscope, a crossover has the appearance of an X and is called a chiasma.

Explanation:

You might be interested in
Small, oddly shaped bones that fill gaps between bones of the skull are called
netineya [11]
I think they are called Sutural. Intra sutural bones also known as the wormian bones are extra bone pieces that occur within a suture (a joint) in the cranium. They are irregular isolated bones that appears in addition to the usual centers of ossification of the cranium and they are not rare bone despite being unusual.
7 0
3 years ago
What is the possible consequences of adding an organism to a food chain?
jasenka [17]

If an invasive species is added into a food chain/web, it becomes overpopulated/a pest because it has no natural predators.

It can also disrupt the food chain/web by eating the food supplies of the native organism leading to competitions.

6 0
4 years ago
Read 2 more answers
What happens in meiosis during telophase ii
Zepler [3.9K]
During telophase II, the fourth step of meiosis II, the chromosomes reach opposite poles, cytokinesis occurs, the two cells produced by meiosis I divide to form four haploid daughter cells, and nuclear envelopes (white in the diagram at right) form.
7 0
3 years ago
Which type of air mass originates in northern Canada
matrenka [14]
Continental polar air mass this is the type of mass that come from northern Canada
7 0
3 years ago
Read 2 more answers
What does this symbol indicate on a weather map?
Minchanka [31]

Answer:

I think its cold front

Explanation:

8 0
3 years ago
Read 2 more answers
Other questions:
  • How many chromosomes are present in a human cell nucleus
    15·2 answers
  • Why is it important that cells contain catalase?
    12·1 answer
  • PLZ HELP!!!! urgent. question is on the picture. I will mark whoever answers first brainliest . PLZ help!!!! urgent
    7·1 answer
  • How is DNA used as evidence for evolution?
    14·1 answer
  • Most of the wood used for fuel comes from native forests around the world. The harvesting of wood for an energy source has serio
    14·2 answers
  • What is the main energy providing molecules in living things
    9·1 answer
  • A driver needs to make a delivery to an office that is 30 km away. The driver has traveled for 45 minutes west down a straight r
    11·1 answer
  • Pick the correct match.
    5·2 answers
  • Interstellar clouds of dust where stars form are known as
    5·1 answer
  • Which body composition measuring system uses the volume of a controlled chamber compared to body volume to determine bodyfat per
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!