emilyhipp9421 emilyhipp9421

16-04-2019
Biology

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What phenotypic ratio would you expect as a result of a test cross between a dihybrid organism and one that is homozygous recessive for alleles at two independent loci?a. 3:1b. 9:3:3:1c. 1:1:1:1d. 1:2:1e. 9:4:2:1

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BioWizard BioWizard

25-04-2019

Answer:

c. 1:1:1:1

Explanation:

Dihybrid organism is an organism that is heterozygous at two different genetic loci. So, for example if there are two loci A and B, dihybrid organism would have AaBb genotype. Homozygous recessive for alleles at two loci has the genotype aabb.

P: AaBb x aabb

The possible genotypes are: AaBb Aabb aaBb aabb

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