A male African clawed frog (Xenopus laevis) and a female Western clawed frog (Xenopus tropicalis) mate and produce multiple hybrid embryos that die early in development. Given this, the deaths of the hybrid embryos are most likely caused by which of the following?A.Improper segregation of sister chromatids during embryonic mitosisB.Sperm and egg incompatibilityC.Reduced production of gametes in the parental speciesD.Improper pairing of homologous chromosomes during meiosis in the embryo
Question
A male African clawed frog (Xenopus laevis) and a female Western clawed frog (Xenopus tropicalis) mate and produce multiple hybrid embryos that die early in development. Given this, the deaths of the hybrid embryos are most likely caused by which of the following?A.Improper segregation of sister chromatids during embryonic mitosisB.Sperm and egg incompatibilityC.Reduced production of gametes in the parental speciesD.Improper pairing of homologous chromosomes during meiosis in the embryo
Solution
The most likely cause of the hybrid embryos' deaths is B. Sperm and egg incompatibility.
Here's why:
A. Improper segregation of sister chromatids during embryonic mitosis - This is unlikely to be the cause because this process happens after fertilization. If there was a problem with this, the embryos would not form in the first place.
B. Sperm and egg incompatibility - This is the most likely cause. The two species, Xenopus laevis and Xenopus tropicalis, are different and may have evolved different mechanisms for sperm and egg interaction. This could prevent the sperm from properly fertilizing the egg, leading to the death of the embryo.
C. Reduced production of gametes in the parental species - This is unlikely because the question states that multiple hybrid embryos are produced, indicating that there is no problem with gamete production.
D. Improper pairing of homologous chromosomes during meiosis in the embryo - This is also unlikely because this process happens in the parents before fertilization. If there was a problem with this, the gametes would not form properly and fertilization would not occur.
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