Most calico cats are female because
A) a male inherits only one of the two X-linked genes controlling hair color.
B) the males die during embryonic development.
C) the Y chromosome has a gene blocking orange coloration.
D) only females can have Barr bodies.
E) multiple crossovers on the Y chromosome prevent orange pigment production.
Answer: A) a male inherits only one of the two X-linked genes controlling hair color.
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DNA sequencing can reveal
A) mutations that do not alter phenotype. B) mutations that do not alter genotype. C) which tissues express a gene. D) how many genes a person has.
The figure illustrates
a. a pyramid of energy. b. a pyramid of biomass. c. a grazing food web. d. a detrital food web. e. the recycling of energy in an ecosystem.
A DNA fragment with a sticky end that reads -ATTCG will bind with another DNA fragment with a sticky end that reads ________
A) TAAGC- B) CGGAT- C) GCCTA- D) ATTGC-
The ____ are the most diverse animal group.
A. vertebrates B. insects C. humans D. protozoans E. mollusks