The human X and Y chromosomes are?

Question

a) called "sex chromosomes" because they determine an individual's sex.
b) both present in every somatic cell of males and females alike.
C) of approximately equal size.
d) almost entirely homologous, despite their different names.
e) all of the above

Answer 1

a
for sure

Answer 2

I"m pretty sure it's A.

Females have two X chromosomes, Men have 1 X and 1 Y. The X and Y are not homologus. Women do not have Y chromosomes in them. In fact, a woman with a Y chromosome is going to have developmental problems.

Two XX chromosomes are homologus, and is the reason women are more likly to carry genetic disorders. Women need 2 recessive traits to express a genetic condition because they have 2 X chromosomes.

Men only need 1 bad gene because they only have 1 X. The flip side is that a man who is not colorblind can never give colorblindness to his kids.

The Y chromosome is a whole different thing. It is totally different from the X. The Y chromosome in most animals is badly damaged because it has no second Y to repair mistakes with. What mamals have done is, the Y chromosome reads like a pallandrome. This allows for self correction because the data is stored in 2 places on the chromosome. The rest of it is junk dna that was long since turned off to make the palendrome work better.

Answer 3

The answer is 'A'. The X chromosome is much larger than the Y chromosome. All male somatic cells are XY while all female somatic cells (meaning not germ cells) are XX. Of course in the female, in essentially every cell one of the X chromosomes is inactivated leading to the presence in the nucleus of what is known as a Barr Body.

Answer 4

X and Y chromosomes determine the sex of an organism (assuming it reproduces sexually). Males are of the XY genotype, females are XX genotype.
They are not the same size, the Y is slightly smaller which probably factors into why there are slightly more men then women, the Y chromosome will travel a little bit faster during reproduction. I believe the answer B is also correct. All cells with nuclei have copies of all your genetic information.

Answer 5

a) females have the chromosomes xx while males have the chromosomes xy. only the x chromosomes are present in both males and females.

Answer 6

A

Females do not have y chromosomes and x chromosomes are a lot larger than the y

Answer 7

Are we doing your homework? There are real easy questions, it would take little effect to learn the subject. No to mention, you can't ask Answers.yahoo during exam.

Answer 8

The answer is (a), just remember "it's the Y that makes the guy"

Answer 9

a

Answer 10

a

Answer 11

a