In the Foofnagle family, the trait of being able to yodel affects members of both sexes in every generation. This trait could be
A) autosomal recessive or autosomal dominant.
B) autosomal dominant but not autosomal recessive.
C) conclusive or inconclusive.
D) caused by something in the environment and not inherited at all.
A) autosomal recessive or autosomal dominant.
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Behavioral traits are useful in differentiating species because behaviors ____
a. are never genetically determined b. related to mating may create prezygotic isolation c. of fossilized specimens are easy to infer d. are independent of morphological characteristics e. are always learned
Any substance that triggers an immune response in the body is called a(n) ________
A) MHC marker B) memory cell C) antigen D) complement
Which of the following is a characteristic seen in prophase I that does NOT occur in prophase II?
A) Chromosomes move to the middle of the cell. B) Spindle formation occurs. C) The number of chromosomes doubles. D) Crossing over occurs.
If two populations of a species show significant structural differences, it is likely that
A. there is little sexual reproduction between populations. B. they are reproductively isolated. C. each is specifically adapted to a certain environmental situation. D. All of the choices are correct.