Why do sperm and egg have 23 chromosomes?

Why do you think humans have two sets of 23 chromosomes?

Humans have two sets of 23 chromosomes because you get a set from your mother and the other set from your father, resulting in two sets. … Sex is determined by the presence or absence of a Y chromosome. Males have Y chromosomes while females do not.

Do sperm and egg cells in humans only have 23 single chromosomes?

The term haploid can also refer to the number of chromosomes in egg or sperm cells, which are also called gametes. … In humans, gametes are haploid cells that contain 23 chromosomes, each of which a one of a chromosome pair that exists in diplod cells.

Where did each set of 23 chromosomes come from?

Normally, each cell in the human body has 23 pairs of chromosomes (46 total chromosomes). Half come from the mother; the other half come from the father.

Why do people have 2 sets of chromosomes?

There is another really important reason for why you have two sets of chromosomes. … The answer is: Because the Y chromosome is much smaller, it does not carry certain genes that the X chromosome has. So males need the X chromosome to survive, whilst the Y chromosome “modifies”/changes their sex.

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Which of the following is formed when 23 chromosomes from the sperm cell and 23 chromosomes from the egg combine?

During fertilization, gametes from the sperm combine with gametes from the egg to form a zygote. The zygote contains two sets of 23 chromosomes, for the required 46.

Why do sperm and egg cells only have half the normal number of chromosomes?

If people reproduced by taking 23 pairs of chromosomes from the mother and 23 pairs of chromosomes from the father, the baby would have too many chromosomes (46 pairs). So eggs and sperm carry only half the usual number of chromosomes — just 23 unpaired chromosomes, carrying one version of each gene.

Does the dad determine gender?

A child’s sex is always determined by the father, since men cast the deciding chromosome — either an X or a Y — while women produce eggs that carry an X chromosome.