If you mate a donkey (2n = 62) with a horse (2n = 64) you get a mule. Mules are sterile and cannot produce gametes by meiosis because they
A. contain too few chromosomes.
B. have an odd number of chromosomes.
C. have an even number of chromosomes.
D. contain too many chromosomes.
E. lack genes that are essential for life.
B. have an odd number of chromosomes.
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Which of the following can control mRNA stability?
A. The stop codon that is used to terminate translation in the mRNA B. AU rich elements in the mRNA C. distance of the stop codon to the polyA tail D. number of A's in polyA tail
A group of interbreeding individuals occupying the same habitat at the same time is a(n)
A. species. B. guild. C. population. D. equilibrium. E. quadrat.
Flies from populations at fluctuating temperatures should have evolved the greatest capacity for acclimation.
a. true b. false
The major categories of hypersensitivities that typically involve a B-cell immunoglobulin response is/are
A. Type 1 only. B. Type 4 only. C. Type 1, Type 2, Type 3. D. Type 1 and Type 4. E. Type 1, Type 2, Type 3, and Type 4.