Which is an example of a quantitative trait?
A. Twenty-five percent of the offspring from a cross of two fruit flies that are heterozygous for curly wings will have curly wings.
B. A woman who has one allele for color blindness will not be color blind, but a man who has one allele for color blindness will be color blind.
C. A person heterozygous for dwarfism will always have the dwarf phenotype.
D. The alleles of the gene for red hair color is masked by the gene for brown hair color.
E. People who are homozygous for the group of genes associated with skin pigment have either lighter or darker skin than those who are heterozygous for those genes.
Answer: E
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The middle layer of the wall of an artery or vein is made up of
A. valves. B. skeletal muscle. C. smooth muscle. D. endothelium. E. simple squamous epithelial cells.
The acid released in the stomach is
a. carbonic acid. b. hydrochloric acid. c. nitric acid. d. sulfuric acid. e. phosphoric acid.
A single-stranded, straight chain copy of a coding strand of DNA that comes from the process of transcription is
A. DNA. B. tRNA. C. mRNA. D. rRNA.
Mollusk eyes and vertebrate eyes are
A. analogous structures, because they have the same function but derive from different common ancestors. B. homologous structures, because they are derived from the same common ancestor. C. homologous structures, because they have different functions. D. analogous structures, because they arise from the same structures during development.