In a night beauty butterfly, red color of flowers incompletely dominates over white.

In a night beauty butterfly, red color of flowers incompletely dominates over white. When crossing a red-flowered plant with a white-flowered one, 48 plants of the first generation were obtained. From their self-pollination, 240 plants in the second generation were obtained. How many types of gametes can a pink-flowered plant give? How many plants in the first generation have pink flowers? How many different genotypes can be formed in the second generation? How many plants in the second generation have red flowers? the second generation have white flowers?

Let’s designate the gene that causes the red color of the flowers of the night beauty as C, then the gene that leads to the development of white flowers in a homozygous state will be c, plants with pink flowers will be written as Cc.

A plant with red flowers – CC, produces C.

Night beauty with white flowers – сс, produces sex cells c.

All 48 plants in F1 will have the Cc genotype and produce two types of germ cells: c and C.

When crossing them together, the offspring of the following type will be obtained:

plants with red flowers (CC) – 25%;

plants with pink flowers (Cc) – 50%;

plants with white flowers (сс) – 25%.

Answer:

The pink-flowered plant produces 2 types of gametes.

All 48 plants will have pink flowers.

3 different genotypes in F2.

240 * 0.25 = 60 plants in F2 have red flowers.

60 plants in F2 have white flowers.