23 pair chromosomes if one pair of them are unmatched?
2006-10-22 10:43:52 · 8 answers · asked by shadab a 2 in Science & Mathematics ➔ Biology
Beucase the one pair is the x and y chromosome is the pair that determines your gender.
2006-10-22 10:46:58 · answer #1 · answered by asd589 2 · 0⤊ 0⤋
The human male does have a pair of sex chromosomes, just not an identical pair. Normal males have an X and a Y whereas normal females have two X's. Interestingly, one of the female's two X's becomes inactivated randomly, so each of a female's somatic cells (not the eggs) have only one functioning X chromosome, the same as male cells! Also, normally, everyone has two copies of each gene found on the non-sex chromosomes, one on each member of a pair. These two copies may be the same or they may be ever so slightly different. So, even the non-sex chromosome pairs are not necessarily identical either.
2006-10-22 11:02:22 · answer #2 · answered by molgen2000 2 · 0⤊ 0⤋
Sex cells (a sperm or an ova) each have half the DNA chain. The sex determinator X or Y is in the sperm cell.. The ova will always be X. If a Y sperm gets to the egg, the fetus will be XY (male) If it's an X sperm cell, the fetus will be XX (Female).
Y sperm cells are tyically leaner. This means they can swim to the egg faster. That comes at a price though because they will not survive in the woman as long.
X sperm sells are rounder, so they can't swim as easily. However they have more staying power.
If the egg is close to the uterus, it's more likely the child conceived will be a boy. If it's farther away, even if it will be release a couple days later, it's more likely t produce a girl.
Simply put, the genetic infosperm cell pairs up with the information in the egg.
2006-10-22 11:05:33 · answer #3 · answered by Merelda 2 · 0⤊ 0⤋
Sex Chromosomes The nuclei of human cells contain 22 autosomes and 2 sex chromosomes. In females, the sex chromosomes are the 2 X chromosomes. Males have one X chromosome and one Y chromosome. The presence of the Y chromosome is decisive for unleashing the developmental program that leads to a baby boy.
2016-05-21 23:07:56 · answer #4 · answered by Anonymous · 0⤊ 0⤋
There is no requirement that they match exactly. All that is necesary is that the cell replication mechanism be able to choose one or the other sex chromsome for sex. Except for sex cell reproduction, the other chromosomes just double up and split. For sex cells, the mechanism has to choose one from each pair; most of the time this works well enough, but there are some genetic diseases that arise when it doesn't.
2006-10-22 10:50:40 · answer #5 · answered by Anonymous · 0⤊ 0⤋
Huh? I don't really understand the question or most answers.
Maybe this is what you want to know:
Human cells have 46 chromosomes, 23 pairs.
sperm cells have 23, egg cells have 23, when they unite, the resulting cell and all the rest made from it have 46.
2006-10-22 12:04:01 · answer #6 · answered by Alan J 3 · 1⤊ 0⤋
You seem to be ignoring the matching chromosomes residing in the egg.
Both sperm and eggs split each pair of chromosomes and the merge their respective contributions during fertilization
2006-10-22 10:48:53 · answer #7 · answered by arbiter007 6 · 0⤊ 1⤋
"In pairs" does not imply identical or matched - only that they are arranged in sets of two.
2006-10-22 10:54:47 · answer #8 · answered by sonyack 6 · 0⤊ 0⤋