2. In guinea pigs, black coat color (W) is dominant to white coat color (w). Cas

Question

2. In guinea pigs, black coat color (W) is dominant to white coat color (w). Castle and Phillips (1909) transplanted an ovary from a black guinea pig into a white female whose ovaries had been removed. They then mated this white female with a white male. All the offspring from the mating were black in color.

a. Explain the results of this cross.

b. What is the genotype of the offspring from this cross?

c. What, if anything, does this experiment indicate about the validity of the pangenesis and germ-plasm theories?

Explanation / Answer

a. The genes are present on chromosomes, this chromosomes are present in nucleus. When they transferred the nuclues from black pig to anucleated white pig embryo the black pig genes would be there. When they fetrizied this egg with while male, according to law of dominance, the dominat character expresseed, so the offspring is in black in color.

b. The genotypes of the parents are Black WW and white ww.
If the black female is in heterozygous in condtion, some of the offspring should be in white in color. the total black offspring indicates that homozygous dominant condtiono of the black guiena pig.

c. This experiment provides validity of the germplasm theory. According to this theory, the change in the germplasm is only heritable.

Related Questions

Navigate

• Browse (All)
• Browse 2
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.