In the garden peas of one pair of alleles controls the height of theplant and a second pair of alleles controls flower colour. Theallele for tall (T) is dominant to the allele for dwarf (t) and theallele for purple flower colour (P) is dominant to the allele forwhite (p).a. A tall plant with purple flowers crossed with a dwarf plant withwhite flowers produced 50% tall, purple and 50% tall, whiteprogeny. What is the genotype of the parents?b. A tall plant with white flowers crossed with a dwarf plant withpurple flowers produced 25% tall purple, 25% tall white, 25%dwarf purple and 25% dwarf white individuals. What is thegenotype of the parents?
Question
In the garden peas of one pair of alleles controls the height of theplant and a second pair of alleles controls flower colour. Theallele for tall (T) is dominant to the allele for dwarf (t) and theallele for purple flower colour (P) is dominant to the allele forwhite (p).a. A tall plant with purple flowers crossed with a dwarf plant withwhite flowers produced 50% tall, purple and 50% tall, whiteprogeny. What is the genotype of the parents?b. A tall plant with white flowers crossed with a dwarf plant withpurple flowers produced 25% tall purple, 25% tall white, 25%dwarf purple and 25% dwarf white individuals. What is thegenotype of the parents?
Solution
a. The tall plant with purple flowers must be heterozygous for both traits (TtPp) to be able to produce both tall and dwarf offspring, and both purple and white flowers. The dwarf plant with white flowers must be homozygous recessive for both traits (ttpp) because these are the only alleles it can contribute.
b. The tall plant with white flowers must be heterozygous for height (Tt) and homozygous recessive for flower color (pp) to be able to produce both tall and dwarf offspring, and both purple and white flowers. The dwarf plant with purple flowers must be homozygous recessive for height (tt) and heterozygous for flower color (Pp) to be able to produce both tall and dwarf offspring, and both purple and white flowers.
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