In some butterfly populations, there are equal frequencies of alleles that code for black and yellow coloration. This is an example of
A) stabilizing selection.
B) sexual selection.
C) nonrandom mutations.
D) directional selection.
E) balanced polymorphism.
E
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Your friend is taking Accutane for her adult acne. She comes to you and says that she thinks she is pregnant. What is the best advice that you can give her?
A) Not to worry as Accutane has been proven safe for pregnant mothers. B) Accutane is likely to cause skin disorders in her fetus, so she should stop taking it. C) It is best to see her doctor as soon as possible to determine whether or not the drug is safe. D) As long as she is getting adequate nutrition and taking prenatal vitamins, she shouldn't worry about drug effects on the fetus.
In which phase of the cell cycle are cells most often found?
A) interphase B) prophase C) metaphase D) anaphase
In a mating between two individuals that are heterozygous for a recessive lethal allele that is expressed in utero, what genotypic ratio (homozygous dominant: heterozygous: homozygous recessive) would you expect to observe in the offspring?
a. 1:2:1 b. 3:1:1 c. 1:2:0 d. 0:2:1
A muscle contraction that occurs as the muscle lengthens is referred to as a(n):
What will be an ideal response?