Question

You are studying inheritance of various characters in marigolds including flower color (purple or blue), seed color (white or brown) and seed shape (round or oblong). When you cross a plant that is true breeding for blue flowers, white and oblong seeds with a plant that is true breeding for purple flowers, brown and round seeds you find that all of the offspring have blue flowers, and round, white seeds. You then cross these F1 plants with each other and you get the following results:

Blue, brown, oblong - 106

blue, white, oblong - 327

blue, white, round - 1002

blue, brown, round - 338

purple, brown, oblong - 42

purple, white, oblong - 122

purple, white, round - 318

purple, brown, round - 102

You then cross a plant that is heterozygous for flower color and seed shape and is homozygous recessive for seed color with a plant that is heterozygous for flower color and seed color but is homozygous dominant for seed shape.

a) What is the probability that the off spring from this cross will be homozygous recessive for all of the loci?

b) What is the probability that the offspring will have purple flowers?

c) What is the probability that the offspring will have blue flowers and round seeds?

Answer 1