The type of reproductive isolation in which two populations are separated due to the sperm cells of one not being able to fertilize the egg cells of the other is
What will be an ideal response?
gametic isolation
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A person who is homozygous for a mutation of the phenylalanine hydroxylase gene
A. can lead a normal life if the environment is controlled. B. cannot give blood. C. will always develop mental retardation in early infancy. D. will require phenylalanine supplements throughout life. E. Two statements are correct. They can lead a normal life if the environment is controlled by taking phenylalanine supplements.
Humans may contact psittacosis by
A. handling infected birds. B. handling infected birds and the dried excreta of birds. C. consuming undercooked chicken. D. inhaling excreta of dried birds.
If a test cross is performed involving 3 linked genes (A,B and C), the most frequent phenotypes of the offspring are "Abc" and "aBC" and the least common offspring are "abc" and "ABC". What was the genotype in the correct order of the heterozygous individual used in this test cross?
a) Abc/aBC b) BAC/bac c) bcA/BCa d) bAc/BaC
Rods exposed to light will _____
A) depolarize due to the opening of sodium channels B) hyperpolarize due to the closing of sodium channels C) depolarize due to the opening of potassium channels D) hyperpolarize due to the closing of potassium channels