Question

У томатов пурпурная окраска стебля доминирует над зелёной, а рассечённые листья – над цельнокрайними («картофелелистность»). При скрещивании растений томата с пурпурными стеблями и рассечёнными листьями с растениями, имеющими зелёные стебли и рассечённые листья, получено 642 пурпурных рассечённых, 202 пурпурных картофелелистных, 620 зелёных рассеченных и 214 зелёных картофелелистных. Объясните результаты.

Answer 1

А-пурпурная окраска,а-зеленая. В-рассеченные листья,в-цельнокройные.

Р           АаВв    *    ааВв

G АВ Ав аВ ав    аВ ав

F1 АаВВ, АаВв, ааВВ, ааВв, АаВв,Аавв,ааВв,аавв.

Answer 2

Explanation of Results from Tomato Plant Crossbreeding

When crossbreeding tomato plants with purple stems and lobed leaves with plants having green stems and lobed leaves, the following results were obtained: - 642 purple lobed - 202 purple potato-leaf - 620 green lobed - 214 green potato-leaf

The observed results can be explained by understanding the principles of genetic inheritance in plants. In this case, the traits of stem color and leaf shape are governed by specific genetic factors.

Dominant and Recessive Traits: - In genetics, the concept of dominant and recessive traits plays a crucial role in determining the expression of specific characteristics. - Dominant traits are those that are expressed when at least one of the two inherited genes is dominant, while recessive traits are only expressed when both inherited genes are recessive.

Inheritance of Stem Color and Leaf Shape: - The purple stem color and lobed leaf shape are likely governed by dominant genetic factors, while the green stem color and lobed leaf shape are governed by recessive genetic factors. - When plants with purple stems and lobed leaves are crossed with plants having green stems and lobed leaves, the resulting offspring inherit genetic factors for both stem color and leaf shape from the parent plants.

Explanation of Results: - The 642 purple lobed plants are likely the result of inheriting dominant genetic factors for both purple stem color and lobed leaf shape from the parent plants. - The 202 purple potato-leaf plants may have inherited the dominant genetic factor for purple stem color but the recessive genetic factor for lobed leaf shape from the parent plants. - The 620 green lobed plants are likely the result of inheriting recessive genetic factors for both green stem color and lobed leaf shape from the parent plants. - The 214 green potato-leaf plants may have inherited the recessive genetic factors for both green stem color and lobed leaf shape from the parent plants.

In conclusion, the observed results of the crossbreeding experiment can be explained by the principles of genetic inheritance, specifically the interplay of dominant and recessive genetic factors governing stem color and leaf shape in tomato plants.