8. In some grasshopper species there is no Y chromosome. Males of one of these s

Question

8. In some grasshopper species there is no Y chromosome. Males of one of these species have only one X chromosome and 5 pairs of autosomes. Females have 2 X chromosomes and 5 pairs of autosomes. Males therefore have 11 chromosomes and females have 12. Meiosis in females produces eggs with: c. 11 chromosomes a. 5 chromosomes d. 12 chromosomes b. 6 chromosomes e. both a and b 8 9. Meiosis in males produces sperm with: c. 11 chromosomes a. 5 chromosomes d. 12 chromosomes b. 6 chromosomes e. both a and b 9 10. During meiosis in males of this grasshopper species, how many bivalents and how many unpaired chromosomes are present at metaphase 1? c. 11 bivalents, 1 univalent a. 5 bivalents, 1 univalent b. 6 bivalents d. 12 bivalents e. both a and b 10.

Explanation / Answer

During meiosis one cell divides twice to form four daughter cells which are having half the number of chromosomes of parent cell. Therefore, meiosis in female produces egg with 6 chromosomes. Since, male grasshoppers have single sex chromosome, they produces sperm with both 5 and 6 chromosomes (50%). Probably, these males have 5 bivalent and 1 univalent chromosomes during metaphase 1.

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