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
oksano4ka [1.4K]
2 years ago
14

Pairing of homologous chromosomes in prophase of meiosis I appears to be critical for proper alignment, crossing over, and subse

quent separation. This pairing is facilitated by the sharing of sequence homology between homologous chromosomes. If X and Y chromosomes are so different, how can they achieve the necessary pairing?
A. They share short homologies at their respective tips.
B. They do not pair because they are not homologous.
C. They are only different in size, most of the DNA sequences match.
D. A special function of the spindle apparatus forces X and Y chromosomes together.
Biology
1 answer:
ad-work [718]2 years ago
3 0

Answer:

A) They share short homologies at their respective tips

Explanation:

The cells of human contain two types of chromosomes that is autosomal and sex chromosomes.

The 22 pairs of autosomal chromosomes in humans are formed by the pairing of these chromosomes during the meiotic phase via the formation of a structure called synaptonemal complex between homologous sequences.

However, the two types of sex chromosomes called X and Y are not similar in their length but they pair via the formation of synapse which involves very short homologous sequences called "pseudoautosomal regions". The formation of the synapse through this region is called the X-Y body.

Thus, Option-A is the correct answer.

You might be interested in
I need help can someone help me it is a weather question
viktelen [127]

Answer:

I belive the answer is C

7 0
2 years ago
Read 2 more answers
Why is the menstrual cycle an important adaptation for reproduction in humans?
raketka [301]
The menstrual cycle is practically controlled by a system of hormones that is necessary for reproduction, and when the hormone reaches a heightened level, something called estradiol is made, then the stimulation of the ovaries by a luteinizing hormone.

Once that hormone begins developing, the ovaries make an egg that quickly becomes an ovum. The ovary then releases one egg or two during ovulation. The endometrium (the part that sheds its own cells for the menstruation) peaks after ovulation and changes the lining of the uterus to prepare for the hectic process of pregnancy and child labor. 

Hope that was helpful.
5 0
3 years ago
What makes a dominant allele different from a recessive allele
Archy [21]
A dominant allele can produce a dominant phenotype in individuals with one copy of the allele from one or both parents, but a for recessive allele to produce a recessive phenotype, the individual needs to have two copies, one from each parent.
5 0
2 years ago
By which process does carbon dioxide enter a plant?
adoni [48]

Answer:

photosynthesis

Explanation:

mark brainliest

have a great day

3 0
3 years ago
Read 2 more answers
If the lymph system did not do its job, what would be one of the consequences?
lilavasa [31]

Answer:

"*Because the lymphatic system collects excess tissue fluid, if it were not working, swelling (edema) would occur in the tissues. The thymus cleanses the blood from the cardiovascular system of cellular debris and bacteria."

3 0
2 years ago
Other questions:
  • Which sequence describes the order of structures through which air travels in the bird respiratory system? trachea, lung, anteri
    5·1 answer
  • Prior to working at a vita/tce site, all vita/tce volunteers (greeters, client facilitators, tax preparers, quality reviewers, e
    6·1 answer
  • Simplify the expression 2(3) +26–3).
    5·2 answers
  • 3 Which waters contain the most nutrients and plankton for fish to feed on?
    14·2 answers
  • How do you answer this question ????
    6·2 answers
  • Does medical assistance safeguard or impede the birth process?
    12·2 answers
  • Cell Division and Human Repro
    8·1 answer
  • How is the rate of photosynthesis measured
    12·1 answer
  • Scientists are uncertain about the reasons for the dodo’s extinction.
    14·1 answer
  • Lysogeny can result in all of the following EXCEPT immunity to reinfection by the same phage. phage conversion. specialized tran
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!