. If an animals had a haploid number of two (no sex chromosomes), how many genetically different types of gametes could it produce? (Assume no crossing over.) If it had a haploid number of five?
2007-04-09 15:25:24 · 1 answers · asked by Anonymous in Science & Mathematics ➔ Biology
If the haploid number is two, then that means the diploid cells of the body have two pairs of homologous chromsomes. How can these two pairs of chromosomes assort? Think of the first pair as A and a; think of the second pair as B and b.
When these chromosomes assort into gametes, each gamete gets one of each kind of chromosome. The possible combinations of chromosomes are AB, Ab, aB, ab or four genetically different types of gametes. 2^2 = 4 kinds.
If the haploid number is 5, then there are 5 pairs of chromosomes in a diploid cell. The gametes made would have one of each pair, assorted randomly and independently.
ABCDE, ABCDe, ABCdE, .....
2^5 = 32 different kinds of gametes.
2007-04-09 17:55:52 · answer #1 · answered by ecolink 7 · 1⤊ 0⤋