A chemical or physical agent that causes mutations is called a
A) mutator.
B) tautomer.
C) teratomer.
D) mutagen.
D) mutagen.
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In his monohybrid crosses, Mendel deduced that one trait was recessive because that trait was ____
a. not present in the F1 and did not reappear in the F2 b. present in the F1 and in the F2 c. not present in the F1 and reappeared in the F2 d. present only in the parents e. present only in the F2
A testcross involves an individual with the dominant phenotype but unknown genotype being crossed with an individual that has a(n) ________ genotype.
A. homozygous recessive B. homozygous dominant C. heterozygous dominant D. Any of the choices.
Mesoderm gives rise to
A. epidermis. B. digestive tract. C. respiratory tube. D. peripheral nervous system. E. skeletal muscle.
What is the cloaca?
A. The body opening that serves solely as the exit for wastes from a complete digestive tract B. The second region of the intestine C. A muscular digestive organ that chemically and mechanically breaks down food D. The body opening that serves as the exit for digestive and urinary waste; also functions in reproduction E. The terminal portion of the large intestine