A child is born with a lethal dominant allele. This would seem to be impossible since either parent,
had they possessed this allele, would have suffered its lethal effects. What is a possible explanation?
A. The child's allele is a spontaneous mutation that neither parent had to deal with.
B. The allele could have varying expressivity and not always be lethal.
C. The allele could have delayed onset.
D. All of these are possible.
E. None of these is possible.
D
You might also like to view...
Which of the following structural features of epithelial tissues are related to the function of these cells? Epithelial cells _____
A) have polarity B) have a long life span C) have low rates of mitosis and cytokinesis D) are loosely packed
What do gametes, spores, and the gametophyte generation have in common?
a. They are all diploid. b. They are all haploid. c. They are present in vascular plants only. d. They are all produced by meiosis. e. They are all triploid.
Which of the following is NOT promoted by the
active form of phytochrome? a. seed germination b. root growth c. leaf expansion d. stem branching e. none of these
Insects have a __________, with many individual
units. Fill in the blank(s) with the appropriate word(s).