You are working with pea plants again and you identify two new mutants: black fl

Question

You are working with pea plants again and you identify two new mutants: black flowers and thorns. These new mutant phenotypes are dominant over the wild type (pink flowers and no thorns). You cross a pure breeding wild-type plant with a pure-breeding mutant plant and grow an F1 generation. You then test cross the F1 generation with a pure breeding wild type plant and get the following phenotype ratios:

Phenotype: Count:

Black & Thorny------------379

Pink & Thornless---------391

Pink & Thorny-------------111

Black & Thornless-------119

Can you say that these genes are statistically linked?

Black & Thorny:

Please show all work with a valid understanding and reason.

Explanation / Answer

Parental cross (F1 X WT): AaBb X aabb

Gametes: (AB) (Ab) (aB) (ab) X (ab)

Progeny: AaBb Aabb aaBb aabb

Genotypic ratio = 1:1:1:1

Phenotypic ratio = 1:1:1:1

But, the given data shows approximately 4:4:1:1 ratio.

Both the parental combinations are greater than the recombinant progeny.

This shows that both these loci are linked.

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