AP BIOLOGY

Detailed explanation-1: -The Y chromosome is one-third the size of the X chromosome and contains about 55 genes while the X chromosome has about 900 genes. In genealogy, the male lineage is often traced using the Y chromosome because it is only passed down from the father.

Detailed explanation-2: -The Y chromosome is important in determining a person’s biological gender. But it has much less of a say in someone’s genetic makeup, since the X chromosome likely has more than 1, 000 genes whereas the Y chromosome has fewer than 80.

Detailed explanation-3: -The key difference between X chromosome and Y chromosome is that X chromosome does not contain SRY gene (sex-determining region Y), which is the male determining gene while Y chromosome has SRY gene. X chromosome is larger in size and contains a higher number of genes compared to Y chromosome.

Detailed explanation-4: -There are many more X-linked traits than Y-linked traits because the Y chromosome is much shorter and fewer genes than the X chromosome. X-linked genes have distinctive inheritance patterns because they are present in different numbers in females (XX) and males (XY).

Detailed explanation-5: -Sex-linked Inheritance In addition, the human X chromosome contains hundreds of other genes. Because females have two copies of the X chromosome, whereas males have only one (they are hemizygous), diseases caused by genes on the X chromosome, most of which are X-linked recessive, predominantly affect males.