Question

СРОЧНО БИОЛОГИЯ. У дурмана пурпурное окраска цветов доминирует над белой, а колючие семена над гладкой. При скрещивании пурпурных цветов с гладкими семенами получено 394 растения пурпурных с колючими семенами , и 402 пурпурных с гладкими. Их скрещивали с белыми ,колючими растениями.

Answer 1

Дано:
объект признак ген
дурман окраска-пурпурная Р
белая р
семена -колючие S
гладкие s
родители
РPSS пурпурные.колючие
ppss белые.гладкие


Решение:
Р: PPSS x ppss
G: P.S. p.s.
F1 первый закон Менделя -доминирование гибридов первого поколения
PpSs -100% пурпур.кол.

P2: PpSs x PpSs
G P .p.S.s P.p.S.s
F2 третий закон Менделя
независимого наследования и комбинирования признаков

Фенотипический радикал
9 P-S- 3 P-ss 3 ppS- 1 ppss
пурп.кол пурп.гладк бел.кол. бел.гладк

Answer 2

Inheritance of Flower Color and Seed Texture in a Plant

In the given scenario, we are dealing with a plant that exhibits two traits: flower color and seed texture. The plant has two possible flower colors, purple and white, and two possible seed textures, spiky (or prickly) and smooth. We need to determine the inheritance pattern of these traits based on the information provided.

According to the information given, the purple flower color is dominant over the white flower color, and the spiky seed texture is dominant over the smooth seed texture. This means that when a plant with purple flowers is crossed with a plant with white flowers, the offspring will have purple flowers. Similarly, when a plant with spiky seeds is crossed with a plant with smooth seeds, the offspring will have spiky seeds.

Now, let's analyze the results of the crosses mentioned in the question:

- When purple-flowered plants with smooth seeds were crossed, 394 plants with purple flowers and spiky seeds were obtained. - When purple-flowered plants with spiky seeds were crossed, 402 plants with purple flowers and smooth seeds were obtained.

Based on these results, we can conclude that the inheritance pattern for flower color and seed texture in this plant follows the principle of independent assortment. This means that the genes responsible for flower color and seed texture are located on different chromosomes and segregate independently during gamete formation.

To summarize: - The purple flower color is dominant over the white flower color. - The spiky seed texture is dominant over the smooth seed texture. - The inheritance pattern for these traits follows the principle of independent assortment.

Please let me know if there is anything else I can help you with!