Question

У одного японского сорта бобов при самоопылении растения, выращенного из светлого пятнистого семени, получено: 1/4 – темных пятнистых семян, 1/2 – светлых пятнистых и 1/4 – семян без пятен. Какое потомство получится от скрещивания растения с темными пятнистыми семенами с растением, имеющим семена без пятен?

Answer 1

Получется потомство из Светлопятнистых

Answer 2

This is a question about genetics and inheritance of traits in plants. The Japanese bean variety in question exhibits incomplete dominance, which means that the heterozygous genotype produces a phenotype that is intermediate between the two homozygous phenotypes. In this case, the dark spotted seeds (DD) and the plain seeds (dd) are homozygous, while the light spotted seeds (Dd) are heterozygous. The light spots are the result of blending the dark and plain colors.

To answer the question, we need to use a Punnett square to predict the possible offspring genotypes and phenotypes from crossing a plant with dark spotted seeds (DD) and a plant with plain seeds (dd). The Punnett square is a diagram that shows the possible combinations of alleles from the parents. Here is how it looks:

| | D | D | |----|----|----| | d | Dd | Dd | | d | Dd | Dd |

As you can see, all the offspring will have the same genotype (Dd) and the same phenotype (light spotted seeds). Therefore, the answer is that the offspring from crossing a plant with dark spotted seeds and a plant with plain seeds will all have light spotted seeds. This is an example of a monohybrid cross, where only one trait is considered.

If you want to learn more about genetics and inheritance, you can check out these web sources: [1](https://online-otvet.ru/biologia/5cea8a8f96f4e19a292a5032), [2](https://licey.net/free/6-biologiya/20-sbornik_zadach_po_genetike_s_resheniyami/stages/282-1_nepolnoe_dominirovanie_i_kodominirovanie.html), [3](https://infourok.ru/kontrolnaya_rabota_po_razdelu-169330.htm). I hope this helps you understand the question better.