Question

For a particular plant, red flowers (A) are dominant over yellow flowers (a). An initial cross was made between a plant that was true-breeding for red flowers and another plant true-breeding for yellow flowers. F1 progeny, all having red flowers, were allowed to self- pollinate and form seeds, which were then planted to generate F2 progeny. Pollen from all the resulting F2 plants was pooled and used to fertilize true-breeding yellow plants. What proportion of the progeny resulting from this cross would be expected to have yellow flowers

Answer 1

The correct answer would be - 1 out of 4 or 25% offspring would be expected to have yellow flowers

Step-by-step explanation:

Red flowers are dominant over the yellow flower, initially, a cross was made between true-breeding red and true-breeding of yellow flowers

Red flower plant gametes, a and a and red plants gamete would be A and A.

so,

A A

a Aa Aa

a Aa Aa

in this cross, all the offspring are red as they have a heterozygous genotype. Now self-pollinating these F1 generation offsprings, gametes would be A and a for both parents:

A a

A AA Aa

a Aa aa

in the f2 generation, there is only 25% of offsprings are yellow flowers.