The red kernel color in wheat is caused by the presence of at least one dominant allele from each of two independently segregating gene pairs (e.g., R-B-). Wheat plants with rrbb genotypes have white kernels, and plants with genotypes R-bb and rrB- have yellow kernels. If you cross a plant true breeding for red kernels with a plant true breeding for white kernels, a. what is the expected phenotype(s) and ratios of the F1 plants

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ajeigbeibraheem ajeigbeibraheem · Answer 1 · 2020-02-08T08:01:43+01:00

Answer:

The expected phenotype(s) are: (RrBb, RrBb,RrBb, RrBb)

The phenotypic ratio = 100% Red kernels

The genotypic ratio = 100% all heterozygous RrBb plants

Explanation:

Given that;

R-B- = red kernel color

rrbb = white kernels

R-bb and rrB- = yellow kernels

Now, if a true breeding for red kernel (i. e RRBB) crosses with a true breeding for white kernel (i.e rrbb)

If RRBB self crossed; we have RB and RB

If rrbb self crossed; we have rb and rb

For the F1 plant cross; we have:

RB RB

rb RrBb RrBb

From above; it is seen that:

The phenotypic ratio = 100% Red kernels: &

The genotypic ratio = 100% all heterozygous RrBb plants

throwdolbeau throwdolbeau · Answer 2 · 2022-01-18T11:12:25+01:00

Given:

R-B- = red kernel color

rrbb = white kernels

R-bb and rrB- = yellow kernels

For a true breeding for red kernel (i. e RRBB) crosses with a true breeding for white kernel (i.e. rrbb)

If RRBB self crossed; we have RB and RB

If rrbb self crossed; we have rb and rb

A phenotypic ratio is a quantitative relation between phenotypes showing the number of times the frequency of one phenotype correlates with another.

The phenotypic ratio = 100% Red kernels.

The genotypic ratio is the ratio depicting the different genotypes of the offspring from a test cross.

The genotypic ratio = 100% all heterozygous RrBb plants

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