A man with opalescent dentine marries a woman with normal teeth. One of the man's parents has opalescent dentine; the other parent of the man was normal. Neither parent of the woman had opalescent dentine. What ratio of affected (those with opalescent dentine) to unaffected (normal) would be found in the children produced through the marriage of the man and woman in the first sentence of this problem? What genotypes are associated with the ratios?

a. 3DD;1Dd
b. 1Dd:1dd
c. 3dd:2Dd
d. 3dd:4DD
e. none of these

Which prevent errors in dna replication? a. helicase enzyme checks the dna for errors. b. each base can attach to only one other type of base. c. ribosome enzymes prevent errors from happening. d. dna contains no complementary base pairs.

In the context of the neural impulse, which of the following is true about the depolarization of neuron membranes?

What is the difference between sex-linked traits and autosomal traits in humans? a. sex-linked traits can only be passed from fathers to sons, while autosomal traits can be passed on from both parents to offspring of any sex. b. sex-linked traits are passed on through the x and y chromosomes, while autosomal traits are passed on through the other 22 chromosomes. c. sex-linked traits only affect females, while autosomal traits affect both males and females. d. sex-linked traits refer to genes that are on the x and y chromosomes, while autosomal traits refer to genes on all 23 chromosomes.