Why do human males have Y chromosomes?

Answer 1

No, males of all species do not have Y chromosomes. Some species use other chromosomes for sex determination. Some birds and insects use a ZW chromosome system for sex determination, for example. There are also species whose sex is environmentally determined. For example, the sex of some reptiles is determined by the temperature at which their eggs are incubated.

Answer 2

The Y chromosome is one of the two sex chromosomes in humans (the other is the X chromosome). The sex chromosomes form one of the 23 pairs of human chromosomes in each cell. The Y chromosome spans about 58 million base pairs (the building blocks of DNA) and represents almost 2 percent of the total DNA in cells. Each person normally has one pair of sex chromosomes in each cell. The Y chromosome is present in males, who have one X and one Y chromosome, while females have two X chromosomes. Identifying genes on each chromosome is an active area of genetic research. Because researchers use different approaches to predict the number of genes on each chromosome, the estimated number of genes varies. The Y chromosome likely contains between 70 and 200 genes. Because only males have the Y chromosome, the genes on this chromosome tend to be involved in male sexual determination and development. Many genes are unique to the X or Y chromosome, but genes in an area known as the pseudoautosomal region are present on both chromosomes. As a result, men and women each have two functional copies of these genes. Many genes in the pseudoautosomal region are essential for normal development. Genes on the Y chromosome are among the estimated 20,000 to 25,000 total genes in the human genome. There are many genetic conditions related to genes on the Y chromosome. (taken from: http://ghr.nlm.nih.gov/chromosome=Y)

Answer 3

Human males have Y chromosomes because they inherit one from their father during fertilization. The Y chromosome carries genes that determine male sex characteristics, such as the development of testes and the production of sperm. It plays a crucial role in determining the biological sex of an individual.

Answer 4

it is called that because it is a numerical letter answered by a 43 year old who is single and wanting to date someone who is in their 40's so give me a ring at 13524985762

Answer 5

Men have a y chromosome for their hair and other stuff.