In raspberries, red fruits and a thorny stem are the dominant traits. And yellow fruits and a smooth

In raspberries, red fruits and a thorny stem are the dominant traits. And yellow fruits and a smooth stem are recessive. As a result of crossing plants that are diheterozygous for both traits with plants that have yellow fruits and a smooth stem, 200 offspring were obtained. How many of them will have yellow fruits and thorny stem?

Let’s designate the gene that causes the development of red berries in raspberries as B, then the gene for yellow raspberries will be b.

Let’s designate the gene for the development of a thorny stem in raspberries as C, then the gene responsible for the development of a smooth stem will be c.

The parent plants of the raspberry are, according to the condition, diheterozygous. According to the introduced designations, we will write them as ВbСс. Such plants produce germ cells BC, bc, Bc and bC.

The offspring of such raspberry plants will look like this:

raspberries with red berries and a thorny stem (2ВbСС, ВВСС, 2ВВСс, 4ВbСс);

raspberries with yellow berries and a thorny stem (2bbСс, bbСС);

raspberry with yellow berries and smooth stem (bbcc);

raspberry with red berries and smooth stem (2Вbcc, BBcc).

(3 * 100) / 16 = 18.75%.

200 * 0.1875 = 37.5

Answer: 37 (or 38) out of 200 plants obtained will produce yellow berries and have a thorny stem.