The F2 phenotypic ratio of 9:3:4, as shown above, is a result of a cross involving
a. two genes expressing complete dominance.
b. a gene expressing dominance and another gene expressing codominance.
c. two genes expressing codominance.
d. epistasis, in which one gene modifies the expression of the other gene.
e. multiple alleles.
ANSWER: d
You might also like to view...
Temperature is perhaps the most important factor in the distribution of organisms because
A. water is scarcer in warmer environments. B. most organisms are unable to regulate their body temperature precisely. C. many organisms are able to grow faster in warmer climates. D. the metabolic optimum for endothermic animals is in temperate areas. E. wind amplifies the effect of cool temperatures.
Hypertension is caused by all of the following EXCEPT ________.
Fill in the blank(s) with the appropriate word(s).
____________________ is a substance released from metabolically active muscle and its concentration in the blood
can be used to assess kidney function. Fill in the blank(s) with the appropriate word(s).
The island of Surtsey, which formed from volcanic eruptions, was first colonized by _____.
A. bacteria and fungi B. lichen C. mosses D. vascular plants E. seagulls