Two pure-breeding mutant plants produce white flowers. When they are crossed, all of the progeny have wild-type purple flowers. What does this genetic complementation tell you?
A) The genes are part of distinct biosynthetic pathways.
B) The two lines exhibit different mutations in the same gene.
C) More than one gene is involved in determining the phenotype.
D) The allele is pleiotropic.
E) The allele exhibits incomplete dominance.
C
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Water is most dense and thus heaviest at 4?C. At 0?C, ice forms and the ice can float on liquid water. Suppose ice were more dense than water at 0?C. What would happen in a lake at this temperature?
A. The ice would cover the bottom of the aquatic system and would build up in layers over time. B. Ice would not form because solids are always less dense than liquids. C. The ice would cover the surface of the aquatic system and would never melt. D. The cold temperatures and the subsequent ice formation would prevent hydrogen bonds from forming between the water molecules, thus causing the existing ice crystals to become disassociated from each other.
During a study of two closely related animals, it did not appear as though they were reproductively isolated until the possibility that their different niches could result in ____ isolation was noted
a. ecological b. gametic c. temporal d. behavioral e. mechanical
Genetic goitrous cretinism is caused by lack of the enzyme to synthesize ____________________
from phenylalanine. Fill in the blank(s) with the appropriate word(s).
The smallest arteries, called ________, are barely visible to the unaided eye
Fill in the blank(s) with correct word