Why is it necessary that pollen grains and ovules (eggs) contain only half the proper amount of DNA?
2007-01-11 15:57:26 · 4 answers · asked by Sarah S 3 in Science & Mathematics ➔ Biology
Eggs and pollen grains only contain half the amount because they must be fertilized to survive. If they contain all the DNA already, what is the point of fertilization. Also, if they contain more than half, and are fertilized, a genetic mutation occurs and the cell may not survive.
2007-01-11 16:46:40 · answer #1 · answered by supersciencenerd 1 · 0⤊ 0⤋
Wait, I thought the whole point of sexual reproduction was to create a diploid organism. So, the guy above is misinformed. You and I are diploid. Diploidy does not kill an organism. Eggs and pollen are haploid so that the two can join together to generate an organism with the correct number of chromosomes.
2007-01-12 00:40:24 · answer #2 · answered by Anonymous · 0⤊ 0⤋
When the two half's combine, they become one full zygote. Like in a human, an egg and sperm each have 23 chromosomes but when they combine, they have 46 like a normal cell.
2007-01-12 00:06:21 · answer #3 · answered by ACE-MAN 3 · 0⤊ 0⤋
if they both contained full sets of dna when fertilazation occured the zygote would be diploidy and most like would not survive.
2007-01-12 00:16:59 · answer #4 · answered by Amber 4 · 0⤊ 0⤋