consider the chromosomal makeup of drosophila melanogasterA

consider the chromosomal makeup of drosophila melanogaster.A single drosophila sperm cell contains 4 chromosomes.

a. How many chromosomes would be present in spermatocyte ready to begin meiosis.
b. During metaphase I of meiosis,how many chromatids would be present?
c.How many chromatids would be present during metaphase II
d. How many chromatids would be moving toward each pole during anaphase II

a) 8. A sperm cell is haploid (n =4), so a spermatocyte, which is diploid (2n) will have 8 chromosomes b) 16. 2 chromatids/chromosome (there are 8 chromosomes in spermatocyte in metaphase I) c) 8. After meiosis I, secondary spermatocyte is haploid (n = 4 chromosomes). 2 chromatids/chromosome means 8 chromatids in all d) 4. One of each pair of the 8 chromatids will move to one pole.

consider the chromosomal makeup of drosophila melanogasterA

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