1. Chromosomes. Muntjacs are deer native to Southeast Asia, South China, and the

Question

1. Chromosomes. Muntjacs are deer native to Southeast Asia, South China, and the Indian peninsula. The Indian muntjac (Muntiacus muntjak) is a fascinating animal from the evolutionary and genetic points of view. The somatic cells of this animal have only 6 chromosomes in females, and 7 chromosomes in males .
(a) What is the haploid number of chromosomes in male and female muntjacs?
(b) What is the diploid number of chromosomes in male and female muntjacs?
(c) How many chromosomes male and female somatic cells in the G2 phase of the cell cycle have?
(d) How many chromosomes do male and female somatic cells in the G1 phase of the cell cycle have?
(e) In all animals, gametes: sperms and ova, are formed in the gonads: testes and ovaries, respectively. During gametogenesis in this animal, how many chromosomes are present in cells at the completion of meiosis I?
(f) How many chromosomes are present in gametes at the conclusion of meiosis?

Explanation / Answer

a. The haploid number of chromosomes in female muntjacs is 3 and in male muntjacs is 4 or 3. ----------- b. The diploid number in male muntjacs is 7 and in female muntjacs is 6. ---------- c. In the G2 phase, female somatic cells contain 12 chromosomes and male somatic cells contain 14 chromosomes. ---------- d. In the G1 phase, female somatic cells contain 6 chromosomes and male somatic cells contain 7 chromosomes. ----------- e. At the completion of meiosis I, female cells will have 6 chromosomes each and male cells will have 7 chromosomes each. --------- f. At the conclusion of meiosis, female gametes have 3 chromosomes each while males have two types of gametes-one with 4 chromosomes and one with 3 chromosomes.

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