Question

Which one is found in males only?
A. X-chromosome
B. Y-chromosome
C. 2X-chromosomes
D. X+X-chromosomes

Answer 1

In humans, the chromosome structure of sex selection is of the XX-XY type. In humans, the nucleus of each cell comprises 23 pairs of body character chromosomes and one pair of sex chromosomes.

Complete answer:
The sex-determining mechanism is a biological system that defines the development of sexual traits in an organism. Many of the species that make up their descendants by sexual reproduction have two sexes. In several animals, sex determination is genetic: females and males have non-identical alleles or even distinct genes that determine their sexual morphology. In the case of humans, the sex-determining process is XX-XY type. Of the 23 pairs of chromosomes present, 22 pairs are almost the same in both females and males; these are autosomes. A pair of X-chromosomes is found in the female, while the existence of the X-chromosomes and the Y-chromosomes decides the male characteristics.
The Y-chromosome is one of two sex-chromosomes in mammals. The second one is the X-chromosome. In many organisms Y-chromosome is generally sex determinant, as the absence or presence of Y-chromosome normally decides the sex of offspring. Y is the sexual determiner in many species. Y is the chromosome that causes the development of men. The human chromosome consists of around 59 million simple pairs. Only from father to son the Y-chromosome can pass.

Thus, the correct answer is option B. i.e., Y-chromosome.

Note: The X genes are considered genes that are dosage-sensitive. The presence of dosage-sensitive genes in the X chromosome indicates that two X chromosomes have too many genes, or that one X-chromosome has too few cells compared to its interacting gene network partners.