These are the only vertebrates in which blood flows directly from respiratory organs to body tissues without first returning to the heart.
A. Amphibians
B. Birds
C. Fishes
D. Mammals
E. Reptiles
C. Fishes
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The genetic makeup of an organism is its
(a) phenotype. (b) genotype. (c) locus. (d) gamete.
In an autosomal dominant disorder such as
Huntington disease, the probability of two parents with the gene passing this disorder on to a child is a. 0%. b. 25%. c. 50%. d. 75%. e. 100%.
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
Which of these molluscs commonly have a hinged shell?
A) gastropods only B) bivalves only C) cephalopods only D) gastropods and bivalves