Suppose that the same a b doubly heterozygous plants are se

Suppose that the same a +/+ b doubly heterozygous plants are selfed. What proportion of plants with the double recessive a b phenotype do you expect in the next generation? (Hint: Use a Punnett square showing all gametes from each parent and their frequencies.)

The aa+bb+ heterozygote will produce four types of gametes: ab, a⁺b, ab⁺, a⁺b⁺

Punnett square:

Therefore, only 1:16 of total plants can be expected to be double recessive phenotype in the next generation (underlined).

	ab	a⁺b	ab⁺	a⁺b⁺
ab	abab	a⁺bab	ab⁺ab	a⁺b⁺ab
a⁺b	aba⁺b	a⁺ba⁺b	ab⁺a⁺b	a⁺b⁺a⁺b
ab⁺	abab⁺	a⁺bab⁺	ab⁺ab⁺	a⁺b⁺ab⁺
a⁺b⁺	aba⁺b⁺	a⁺ba⁺b⁺	ab⁺a⁺b⁺	a⁺b⁺a⁺b⁺

Suppose that the same a +/+ b doubly heterozygous plants are selfed. What proportion of plants with the double recessive a b phenotype do you expect in the next

Suppose that the same a b doubly heterozygous plants are se

Solution

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