Mendel correctly surmised that the 3 dominant:1 recessive phenotypic ratio seen in the F2 generation pea plants was due to
a. a tendency to have more fertilization events yielding homozygous dominant than homozygous recessive.
b. homozygosity.
c. genotypic selection.
d. random combination of sperm and egg with respect to the allele carried.
e. certain phenotypes having a selective advantage.
D
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The most unique feature of the echinoderms is their:a
digestive system. b. nervous system. c. closed circulatory system. d. water vascular system. e. mantle.
The letter “A” in the above figure represents
a. ground tissue. b. dermal tissue. c. vascular tissue. d. apical meristem. e. shoot root combination.
Identify and briefly describe the process(es) of cellular respiration that occur in the mitochondria. Indicate the amount
of ATP, NADH, and FADH2 produced in each process. What will be an ideal response?
Caenorhabditis elegans is a nematode. During its development, it produces more than 1000 cells. However, the adult worm has only 959 somatic cells. The process by which 131 cells are specifically targeted for destruction is called______________
(a) directed cell pruning. (b) programmed cell death. (c) autophagy. (d) necrosis.