In your favorite plant the dominant R allele allows producti

In your favorite plant, the dominant R allele allows production of red pigment in the flowers, while the recessive r allele produces white flowers. At a second independently segregating gene, the dominant I. allele allows production of large flowers, while the recessive r allele produces small flowers. You cross two plants and get the following offspring: In the table, write the genotype of each progeny class. Use a dash or blank underline if both alleles are possible. What were the genotypes of the two parents? Stan by determining the phenotypic ratio for each trait individually. Use this to deduce the genotypes of the parents for each trait. Then put it all together. Draw a branched line diagram to represent the phenotypes produced in this cross.

Solution

Red color----------dominant allele-------R

White color----------recessive allele-------r

Large -------------dominant allele-------L

small ----------recessive allele-------l

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By crossing F1 PLANTS WITH GENEOTYPE PRODUCES FOUR PHENOTYPES

PARENTS

RED LARGE ------ GENOTYPE----------- RRLL

white small ------ genotype----------- rrlll

GENOTYPE----------- RRLL             X genotype----------- rrlll

F1 OFFSPRING =           RED LARGE ------ GENOTYPE----------- RrLl

F1 OFFSPRING ------ GENOTYPE----------- RrLl          x    ----------- RrLl                     F1 OFFSPRING

RL

Rl

rL

rL

RL

Rl

rL

rL

genotypes

Large red

289

LLRR

Small red

104

Rrss

Large white

302

Llrr

Small white

98

llss

	RL	Rl	rL	rL
RL
Rl
rL
rL