What conclusions would you reach about the genotypes of the parents if the offsp

Question

What conclusions would you reach about the genotypes of the parents if the offspring had phenotypes that resulted in the following proportions: (a) 9:3:3:1; (b) 1:1:1:1

List all that apply...

1. (a) A 9:3:3:1 ratio is expected among progeny from an F2 cross in which (1) both parents are heterozygous for two gene pairs; (2) partial dominance is in effect;
(b) A 1:1:1:1 ratio is expected among progeny from a backcross involving two gene pairs, that is, Aa Bb x aa bb
2. None of these

3. (a) A 9:3:3:1 ratio is expected among progeny from an F2 cross in which (1) both parents are heterozygous for two gene pairs; (2) complete dominance is in effect;
(b) A 1:1:1:1 ratio is expected among progeny from a backcross involving two gene pairs, that is, Aa Bb x aa bb

4. (a) A 9:3:3:1 ratio is expected among progeny from an F2 cross in which (1) both parents are homozygous for two gene pairs; (2) complete dominance is in effect;
(b) A 1:1:1:1 ratio is expected among progeny from a backcross involving two gene pairs, that is, Aa Bb x aa bb
5. (a) A 9:3:3:1 ratio is expected among progeny from an F2 cross in which (1) both parents are heterozygous for two gene pairs; (2) partial dominance is in effect;
(b) A 1:1:1:1 ratio is expected among progeny from a backcross involving two gene pairs, that is, AA BB x aa bb

Explanation / Answer

What conclusions would you reach about the genotypes of the parents if the offspring had phenotypes that resulted in the following proportions: (a) 9:3:3:1; (b) 1:1:1:1

List all that apply...

1. (a) A 9:3:3:1 ratio is expected among progeny from an F2 cross in which

(1) both parents are heterozygous for two gene pairs;-dihybrid crosss gives 9:3:3:1; ratio

(2) partial dominance is in effect;

(b) A 1:1:1:1 ratio is expected among progeny from a backcross involving two gene pairs,

that is, Aa Bb x aa bb --TEST CROSS

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