DiGeorge's syndrome is a developmental defect that prevents the maturation of the thymus. What cell type would be reduced by this condition?
A) T cells
B) B cells
C) macrophages
D) lymphocytes
Answer: A
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In the life cycle of an angiosperm, which of the following stages is diploid?
A) megaspore B) generative nucleus of a pollen grain C) polar nuclei of the embryo sac D) microsporocyte E) both megaspore and polar nuclei
Exotic, or introduced, species can permanently disrupt native communities when they ________
a. destroy crops or natural vegetation used by other species b. all of the choices c. prey on community members and depress their numbers d. outcompete native species for access to space, light, or nutrients
Different, or alternative, forms of the same gene are called
a. genetomorphs. b. alleles. c. mutants. d. chromatids. e. homologous.
Which of the following statements about homologous chromosome pairs is false?
a. They come from only one of the individual's parents. b. They usually contain slightly different versions of the same genetic information. c. They separate from each other during meiosis I. d. They synapse during meiosis I. e. Each contains two sister chromatids at the beginning of meiosis I.