would any of the gametes have been the same if crossing over is not at work?

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would any of the gametes have been the same if crossing over is not at work?

2006-07-23 20:58:07 · 3 answers · asked by annarsirk 1 in Science & Mathematics ➔ Biology

3 answers

can you provide some more details so i can provide a proper answer?

2006-07-23 22:08:47 · answer #1 · answered by Anonymous · 2⤊ 1⤋

The number of different gametes would be 2^n, where n is the haploid number of chromosomes. So for humans you would have 2^23=8.4 * 10^6 (approx 8.5 million) different gametes, when crossing over doesn't occur. Normally you have 20-150 million sperm cells per ml of semen and 1.5 to 5 ml per ejaculation. Thus you would have some gametes that are identical.

2006-07-24 05:42:50 · answer #2 · answered by bellerophon 6 · 0⤊ 0⤋

crossing over might take place before gamet formation. But it is not a hard and fast requirement

2006-07-24 05:06:53 · answer #3 · answered by K Gupta 2 · 0⤊ 0⤋