Maternal effect genes
A. are all found on the X chromosome.
B. are expressed only in female offspring.
C. can encode proteins that get translated upon fertilization to establish concentration gradients that span the egg.
D. are expressed only in male offspring because they are hemizygous.
E. are expressed when exposed to high concentrations of estrogen.
C. can encode proteins that get translated upon fertilization to establish concentration gradients that span the egg.
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Which of the following can be used in creating a vaccine?
A) attenuated bacteria B) inactivated viruses C) recombinant proteins D) attenuated bacteria, inactivated viruses, or recombinant proteins
Nondisjunction during meiosis results in an abnormal number of chromosomes in one or more gametes. In some cases of nondisjunction, a single chromosome fails to separate. In others, none of the chromosomes separate. Suppose an egg is produced in which none of the chromosomes separate during meiosis II. What is the chromosome number of the zygote that results if this egg is fertilized by a normal sperm?
A. 1n B. 2n C. 2n + 1 D. 3n
Among other bones, the axial skeleton includes the ________.
a) thoracic cage and vertebral column b) thoracic cage and pectoral girdle c) skull and pelvic girdle d) pectoral and pelvic girdles
Codons are _____ of mRNA that specify different _____.
A) nuclei, DNA B) proteins, genes C) base triplets, amino acids D) polypeptides, proteins