The ART that is employed exclusively to deal with male infertility problems is _____________
A. IUI D. ZIFT
B. IVF E. more than one of these
C. GIFT
A
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You are studying body color in an African spider and have found that it is controlled by a single gene with four alleles: B (brown), br (red), bg (green), and by (yellow). B is dominant to all the other alleles, and by is recessive to all the other alleles. The bg allele is dominant to by but recessive to br. You cross a brown (B/by) spider with a pure-breeding green spider. Predict the phenotype of the progeny.
A. all yellow B. half brown, half green C. three-fourths brown, one-fourth green D. all brown E. all green
Human DNA and chimpanzee DNA differ by
A) about 1%. B) about 3%. C) more than 10%. D) the same amount that human DNA differs from orangutan DNA.
Imagine in lemmings, that gray fur color (G) is dominant over white (g). There is another gene, called color, and individuals must have at least one color (C) allele for gray color to be expressed. A lemming that is heterozygous at both loci is crossed with a white lemming that is heterozygous for gray fur color. Which of the following is correct regarding their offspring?
A. 1/4 will be gray; 3/4 will be white B. 3/8 will be gray; 5/8 will be white C. all will be white D. they will have a ratio of 9 gray:7 white E. all will be gray
Tuberculosis is caused by a
A. fungus. B. bacterium. C. worm. D. protist. E. virus.