The information within the central squares of a Punnett square represents
A. parental genotypes.
B. parental gametes.
C. offspring genotypes.
D. gamete phenotypes.
C. offspring genotypes.
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Which of the following statements comparing endotherms and ectotherms is correct?
A) Mitochondrial density and enzyme activity are 3-4 times higher in the cells of ectotherms than in the cells of endotherms of similar size. B) Endotherms can use more of their energy intake for reproduction than ectotherms can. C) Endotherms and ectotherms have about the same mass-specific metabolic rate. D) Both endotherms and ectotherms exchange heat with the environment through convection, conduction, radiation, and evaporation.
What can be said about sex-determination in humans?
a. All human sperm carry a Y chromosome. b. 25% of human zygotes are XY. c. All zygotes carry a Y chromosome. d. Sex depends upon which type of sperm fertilizes the egg. e. All human eggs carry a Y chromosome.
All fungi ____
a. are saprobes b. digest food extracellularly c. are parasites d. digest food intracellularly e. can ingest food particles
Shingles, or herpes zoster, is caused by the virus that also causes
A) cold sores. B) chickenpox. C) smallpox. D) molluscum contagiosum. E) warts.