A female mouse that is heterozygous for fur color where dark fur is dominant to light...

A female mouse that is heterozygous for fur color where dark fur is dominant to light fur and homozygous dominant for long-tail length is mated with a male that is heterozygous for both traits. How many genotypes will be represented in the F1 generation?

	A.	1/32
	B.	1/16
	C.	1/8
	D.	1/4
	E.	1/2

Expert Solution

dihybrid cross shows 1/4 gfenotypes in the f1 geeration

in the above example, the cross is a dihybrid cross in which a breeding experiment between P generation (parental generation) organisms that differ in two traits. The individuals in this type of cross are homozygous for a specific trait or they share one trait. Traits that are characters that are determined by segments of DNA called genes in case of Mendel factor. Diploid organisms inherit two alleles for each gene. An allele is an alternative version of gene expression inherited (one from each parent) during sexual reproduction.

In a dihybrid cross, parent organisms have different pairs of alleles for each trait being studied. One parent possesses homozygous dominant alleles and the other possesses homozygous recessive alleles. The offspring, or F1 generation, produced from the genetic cross of such individuals are all heterozygous for the specific traits being studied. This means that all of the F1 individuals possess a hybrid genotype and express the dominant phenotypes for each trait.

F1 Generation

ibn the mendels experiment the seme condition of above cross in explained by a true-breeding plant (organism with identical alleles) that is yellow and round (YYRR) is cross-pollinated with a true-breeding plant with green and wrinkled seeds (yyrr), as in the example above, the resulting F1 generation will all be heterozygous for yellow seed color and round seed shape (YyRr). The single-round, yellow seed in the illustration represents this F1 generation.

gladiator answered 2 years ago

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