Answer to Question #214537 in Genetics for Moe

Question

2.5) If an organism has a haploid number of three, how many tetrad structures will align on the equatorial plane in metaphase 1 of meiosis?

Answer 1

The question describes an organism with haploid 3 single sets of chromosomes n=3, 

Tetrad in meiosis is the 4 cells produced by meiotic cell division. It is the number of chromatids in each tetrad. So each tread will have 4 chromatids.

So, 3 haploid cell ( n=3 ) has 6 chromatids, so 6 divided by 4 is 1.5 tetrads.

Meiosis I reduces the chromosome number from 4 to 2, and each replicated chromosome has two chromatids and 4 tetrads.

For an organism with a haploid number of three, 1.5 tetrad structures will align on the equatorial plane in metaphase 1 of meiosis. After Meiosis I, the chromosome number reduces and each replicated chromosome has two chromatids.