Question

Which of the following would apply to the pattern of inheritance in a Mendelian trait? A....

Which of the following would apply to the pattern of inheritance in a Mendelian trait?

A. 1:2:1 F1 phenotype ratio

B. 1:2:1 F1 genotype ratio

C. 1:2:1 F2 phenotype ratio

D. 1:2:1 F2 genotype ratio

E. 3:1 F1 phenotype ratio

F. 3:1 F1 genotype ratio

G. 3:1 F2 phenotype ratio

H. 3:1 F2 genotype ratio

I. 9:3:3:1 F2 phenotype ratio

J. 9:3:3:1 F2 genotype ratio

K. 9:3:3:1 F1 phenotype ratio

L. 9:3:3:1 F1 genotype ratio

M. all F1 offspring express the dominant trait

N. all F2 offspring are true breeding

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Answer #1

1:2:1 F2 genotypic ratio

3:1 F2 phenotypic ratio.

9:3:3:1 F2 phenotypic ratio.

All F1 offsrings express dominant trait.

Explanation: because in monohybrid cross of Mendel for example the genotype is AA,AG,AG,aa where three of dominant and heterozygous exhibit same phenotype so 3:1 and genotype 1:2:1 . In same case of dihybrid phenotypic ratio. Yes in mendelian pattern of inheritance the F1 offsprings all produce dominant because they exhibit same as parent phenotype when they cross with dominant and recessive both.for example cross with AA and aa gives Aa which is a dominant trait.

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