Due to Various Causes, Including DDT Poisoning, the Population Size

question 12

Multiple Choice

Due to various causes, including DDT poisoning, the population size of whooping cranes was reduced to about a dozen during the 1970s.The population size has since rebounded, and there are now hundreds of whooping cranes.Which feature would not be expected in the current populations of whooping cranes?

• A) Very low levels of genetic variation
• B) Very few heterozygous individuals
• C) Differences from historical populations in terms of allele frequencies
• D) Considerable genetic polymorphism
• E) A bottleneck effect

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