the fruit fly has 7) The fruit fly has four pairs of chromosomes in its somatic

Question

the fruit fly has

7) The fruit fly has four pairs of chromosomes in its somatic cells. While we have not discussed "crossing over" yet during meiosis, it does not occur in the male fly. Given this fact, how many chromosomally distinct types of sperm can be produced by a male fruit fly (assuming that homologous chromosomes are similar but not identical)? Explain or illustrate how you came to your answer. 8) In humans, the gene for b-globin is located on chromosome 11, and the gene for a-globin, which is another protein component of hemoglobin, is located on chromosome 16. Would these two chromosomes be expected to pair with each other during meiosis? Explain your answer

Explanation / Answer

7). All the sperms produced are genetically different, but identical to the parental cells. This is because, the homologues chromosomes undergo crossing over during meiosis and give rise to recombinant genes (the resulting are not identical to the parental cell). In this case, it is given that the crossing over does not occur but the homologous chromosomes are not identical. So, as they separate during meiosis, they give rise to two different cells, which are also chromosomally different.

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