Cancers originate from a single cell.
Answer the following statement true (T) or false (F)
True
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Postzygotic isolating mechanisms occur when the offspring ____
a. survive to reproductive age b. have vigorous health c. inherit the same numbers of chromosomes from each parent d. inherit different developmental instructions from each parent e. have hybrid viability
When arthropods molt, they may change in four of the following ways. Which one is the exception?
a. body form and maturity b. Sex
c. body size d. eating habits e. sensory structures
The ?32 allele of CCR5 is found at the highest frequency in which of the following populations?
A) Africans B) Japanese C) North Americans D) Europeans E) South Americans
Vasectomy and tubal ligation result in
A) a lack of semen or menstrual flow. B) decreased levels of hormones. C) inability to produce eggs or sperm. D) an interruption of the path taken by the egg or sperm. E) atrophy of the gonads.