For alleles of genes in Hardy-Weinberg equilibrium, the frequency of heterozygotes is represented as
A) p.
B) q.
C) p2.
D) q2.
E) 2pq.
E
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Suppose that in studies of genes on the same chromosome you find the following recombination frequencies: Why is the total distance between a and b less than the distance between a and c plus the distance between c and b?
a. a and b are not linked b. the distances were calculated incorrectly c. b is in between genes a and c d. double crossovers between a and b decrease recombinants e. all three genes encode the same trait
All of the following statements about the endocrine system are TRUE EXCEPT which one?
A) Many hormones are not able to cross the blood-brain barrier. B) Hormones are distributed via the circulatory system. C) Hormones exert their effects on cells that have the specific hormone receptor. D) Hormones act more quickly than the nervous system. E) The endocrine system and the nervous system frequently interact.
Examine the figure above. In the continental United States, the dark green patches show areas with the highest bird species richness (200+ species). What best explains why these areas have such diversity?
A. These areas have the highest temperatures in the continental United States B. These areas have mountainous terrain. C. These areas have low frequencies of extreme weather events and fire. D. These areas have well-protected natural areas.
Why do the same trans-regulatory elements lead to very different morphology in different species of organisms?
A. Different species have genetic codes that use different codons, leading to different amino acid sequences. B. Morphological change depends on sequence mutations in enhancers. C. These regulatory elements have no effect on morphology, only metabolism. D. The transcription factor activates different combinations of enhancers and downstream genes. E. The trans-regulatory elements in different lineages have independently evolved the same sequence, by convergent evolution.