Question

From a large-scale screen of many plants of Collinsia grandiflora, a plant with three cotyledons was discovered (normally, there are two cotyledons). This plant was crossed with a normal pure-breeding wild-type plant, and 600 seeds from this cross were planted. There were 298 plants with two cotyledons and 302 with three cotyledons. What can be deduced about the inheritance of three cotyledons

Answer 1

Answer:

The cross is as follows:

P: D/d × d/d

Explanation:

Half of the F1 progeny are mutant. The mutation results in 3 cotyledons is dominant and the original mutant is heterozygous.

If D denotes the mutant allele and d denotes the wild type allele.

The cross is as follows:

P: D/d × d/d

F1 denotes D/d three cotyledons

d/d denote two cotyledons