In certain salamanders, the sex of a genetic female can be altered, changing her into a functional male; these salamanders are called sex-reversed males. When a sex-reversed male is mated with a normal female, approximately $2 / 3$ of the offspring are female and $1 / 3$ are male. How is sex determined in these salamanders? Explain the results of this cross.
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In most animals, sex is determined by specific sex chromosomes. For example, in humans, XX individuals are female and XY individuals are male. Show more…
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In certain salamanders, the sex of a genetic female can be altered, changing her into a functional male; these salamanders are called sex-reversed males. When a sex-reversed male is mated with a normal female, approximately 23 of the offspring are female and 13 are male. How is sex determined in these salamanders? Explain the results of this cross.
Madhur L.
9. Salamanders are amphibians with very interesting mating rituals. The males perform species-specific dances that attract females to mate. Male salamanders deposit spermatophores (mucus packets filled with sperm) on leaves, twigs, or the ground and guide females over them so females can take them up into their cloaca. Mating dances like this result in internal fertilization in many salamander species. Why are salamanders not entirely terrestrial in spite of exhibiting internal fertilization in many species? [4 pts]
Shaiju T.
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