1. Carriers of the sickle-cell allele (i.e. those with a heterozygous genotype)

Question

1. Carriers of the sickle-cell allele (i.e. those with a heterozygous genotype) are fittest in environments with high frequencies of:

2. Light skin is an evolutionary adaptation that evolved in our human ancestors who lived:

3. Early on in human evolution, natural selection favored dark skin closest to the equator, where sunlight and exposure to UV light is most intense.

True
False

4.

Which one of the following traits evolved first in the hominins?

5.

Scientists think the last common ancestor of African apes and humans was most likely a fully bipedal ape.

True
False

6.

Which of the following has been proposed as a possible explanation for the evolution of bipedalism?

A. Tuberculosis B. Cholera C. Malaria D. various bacterial infections E. HIV/AIDS F. Syphillis G. Small pox

Explanation / Answer

1. Carriers of the sickle-cell allele (i.e. those with a heterozygous genotype) are fittest in environments with high frequencies of:

C. Malaria

Malaria is evolutionary driving force for sickle cell alleles. In sickle cell alleles the HbS allele brings about rise in sickle haemoglobin. HbS heterozygous reduces the risk of malaria. HbS heterozygous alleles are fittest in the environment with high frequencies for malaria.

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