Question

Many laboratory strains of mice are highly inbred, such that the individuals are homozygous for alleles controlling a quantitative phenotype. which of the following would you expect to observe in inbred strains exposed to different environmental conditions?

group of answer choices
a. vp
b. vg=0 (or very small)
c. Ve=0

Answer 1

In inbred lab strains of mice that are homozygous for certain traits, genetic variance (VG) would be minimal or nonexistent, and any observed variability in phenotype would be due to environmental factors. The answer is option B.

Step-by-step explanation:

In highly inbred laboratory strains of mice, individuals tend to be homozygous for alleles controlling a quantitative phenotype.

When exposed to different environmental conditions, you would expect to observe variation in the phenotypic expression primarily due to environmental variance (VE), as the genetic variance (VG) would be very small or zero because of the homozygosity. Since there’s no genetic diversity to account for differences in the phenotype, the environmental factors would be the main cause of any observed variation. Consequently, the answer to the question provided would be b. VG=0 (or very small).