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Home Q & A Board Biology-Related Homework Help Genetics and Developmental Biology
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Ko890 Ko890
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A year ago
The diploid (2n) chromosome number for the African clawed frog (Xenopus laevis) is 36. Consider germ-line cells or gametes of this species before, during, and after meiosis. Complete the chart below indicating how many chromosomes and chromatids an individual cell has at each of the stages
  A.                         Chromosomes        Chromatids
G1 phase   
Metaphase 1
Prophase 2
Sperm or unfertilized egg cell

B. Genomic studies of African clawed frogs have found that all genes present in the genome of male frogs are also present in females. However, some genes found in females are absent in the genome of males. What does this result suggest about the sex determination system of African clawed frogs
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AnonymousAnonymous
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A year ago
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Anonymous
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A year ago
Quote from: Ko890 (A year ago)
Genomic studies of African clawed frogs have found that all genes present in the genome of male frogs are also present in females. However, some genes found in females are absent in the genome of males. What does this result suggest about the sex determination system of African clawed frogs

To add, sex-determination isn't solely controlled by the presence or absence of the Y-chromosomes. For example, the sex determination in humans system based on the presence of the SRY gene on the Y chromosome. In mammals, the presence of the SRY gene leads to male development, while its absence results in female development. This is clearly not the case for the African clawed frogs.
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