Smoking tobacco regularly during pregnancy results
in all EXCEPT
a. increased risk of miscarriage.
b. newborns of lower birth weight.
c. reduced vitamin C levels for the mother-to-be
and for her fetus.
d. fetal facial and cranial deformities.
e. higher incidence of fetal heart defects.
Answer: d
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In many species, lens crystalline protein aggregates in the eyes to form lenses, yet in other cell types, functions as an enzyme. The gene that encodes this protein is therefore
A) pleiotropic. B) incompletely penetrant. C) eclectic. D) mutant.
The hormone involved in childbirth that participates in a positive feedback loop is
1.estrogen. 2.progesterone. 3.somatostatin. 4.oxytocin. 5.vasopressin.
If the sequence of one strand of DNA is CATTACGGG, then the complementary strand would be GTAATGCCC.
Answer the following statement true (T) or false (F)
Consider the case of X-linked inheritance of a recessive mutant allele. Among progeny from a cross of an unaffected male and a heterozygous female carrier,
A: all male offspring of would show the trait. B: all female offspring who receive the recessive mutant X would show the trait. C: all male offspring who receive the recessive mutant X chromosome would show the trait. D: all female offspring would be carriers. E: roughly half of the female offspring would show the trait.