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1) 2) 3) Animals from different species are sometimes able to interbreed, produc

ID: 52267 • Letter: 1

Question

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2)

3)

Animals from different species are sometimes able to interbreed, producing hybrid offspring. Suppose a donkey, which has 62 chromosomes, breeds with a horse, which has 64 chromosomes, and produces a mule. How many chromosomes would the mule have? 2 O 62 0 63 O 126 Why are the offspring generated from interspecies crosses often sterile? The chromosomes are unable to segregate properly during meiosis, resulting in inviable gametes in the hybrid offspring Division during mitosis produces gametes with variable numbers of chromosomes in the hybrid offspring A hybrid offspring's gametes are diploid instead of haploid. The offspring of a hybrid cross rarely have reproductive organs and are not able to produce gametes.

Explanation / Answer

1. The correct option is 63 (31+32).

The correct option is the chromosomes are unable to segregate properly during meiosis, resulting in inviable gametes in the hybrid offspring.

2. Mechanical isolation

Habitat isolation

Temporal isolation

Behavioral isolation

3. The correct option is sympatric speciation.

Sympatric speciation is the evolutionary mechanism through which new species evolve from a single ancestral species without being separated geographically.

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