In animal gametogenesis, a single primary spermatocyte generates ________ sperm, while a single primary oocyte generates ________ egg(s).
A) 1; 4
B) 1; 1
C) 4; 2
D) 4; 1
E) 4; 4
D) 4; 1
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Grasses develop
a. a taproot. b. fibrous roots. c. no root cap. d. no root hairs.
Antibody diversity is a consequence of
A) the huge number of antibody genes. B) shuffling of antibody genes into different combinations during B cell development. C) differential regulation of antibody gene expression under different circumstances. D) the many types of viruses that exist in nature.
Which of the first three statements about
independent assortment is NOT true?
a. genes on homologous chromosomes assort independently b. genes on the same chromosome that are far apart tend to assort independently c. genes close together on the same chromosome tend to assort independently d. all of the first three statements about independent assortment are NOT true e. one of the first three statements about independent assortment is NOT true
A __________ is a hybrid, with two nonidentical alleles (Aa). Fill in the blank(s) with the appropriate word(s)