A diploid species has 3 pairs of chromosomes in the somatic cells. In males, the first pair is large submetacentric; the second is medium acrocentric, and the third is small telocentric. In females, the first two pairs are like those of the males while the third is large metacentric with satellite. Illustrate the karyograms of the following: 1. A triploid cell in females 2. A tetrasomic cell in males 3. A tetraploid cell in females

A diploid species has 3 pairs of chromosomes in the somatic cells. In males, the first pair is large submetacentric; the second is medium acrocentric, and the third is small telocentric. In females, the first two pairs are like those of the males while the third is large metacentric with satellite. Illustrate the karyograms of the following:
1. A triploid cell in females
2. A tetrasomic cell in males
3. A tetraploid cell in females

Still using the same species given above, illustrate diagrammatically the following stages of cell division:
1. Anaphase of a dividing primary spermatocyte
2. Anaphase of a secondary oocyte
3. Metaphase of a somatic cell in the female

EXPERT ANSWER

Given, in both male and female the first chromosome pair is large submetacentric, second pair is medium acrocentric. The third pair in male is small telocentric while in female is alrge metacentric with satellite DNA.

1) Triploid cell in female

A Triploid cell contains three copies of each set of chromosomes

2) A tetrasomic cell in male

A tetrasomic condition is appears when a particular chromosome will contain extra pair of chromosome. In this case total no of chromosome increases by 2.

cell division stages..

1) primary spermatocyte undergoes meiosis I to form secondary spermatocyte. During meiosis I the anaphase would like the below figure

(Note that the normal male is diploid in nature)

2) secondary oocyte undergoes meiois II to form mature ovum. In Anaphase II, the homologous chromosome gets separated forming haploid cell (ovum, DNA = N)of secondary oocyte will look like the below figure