A human cell that contains 22 autosomes and a Y chromosome must be:
A. a zygote.
B. a somatic cell of a male.
C. a somatic cell of a female.
D. a sperm cell.
E. an egg cell.
Answer (3)
Well it can't be C because the DNA of female cells do not have any Y sex chromosomes. It also can't be E because of that same reason (the egg is made by the female, so it can only contain her genes).It can't be A because zygotes are diploid (because the egg and sperm, both haploid with 23 chromosomes, fuse together to double the amount of chromosomes), so a zygote would have to have 46 chromosomes, not 23 with 22 being autosomal and 1 being allosomal/sexual like the question states. And finally, it can't be B because somatic cells are also diploid and have 46 chromosomes. Another clue it can't be B is that the question states it has only a Y chromosome, which means the cell can't be diploid because a diploid cell has two allosomal chromosomes, either XX or XY.
A human cell with 22 autosomes and a Y chromosome is a male sperm cell. Sperm and egg cells contain 23 chromosomes, including one sex chromosome, while other cells typically have 46 chromosomes. ;
The human cell with 22 autosomes and a Y chromosome must be a sperm cell, making option D the correct answer. Sperm cells are haploid and can carry either an X or Y chromosome. Other cell types listed do not match this chromosome configuration.
;
