Question

Червоне забарвлення квіток нічної красуні детерміноване геном (R), а біле забарвлення - геном (г). Гетерозиготні рослини мають рожеві квітки. Рожеві квітки запилили пилком із червоних квітів. Який фенотип і геногип матимуть гібриди від цього схрещування?

Answer 1

Ответ:

25% потомства будет иметь красные цветки.

50% потомства будет розовые цветки

25% потомства будет иметь белые цветки.

Answer 2

Phenotype and Genotype of Hybrids from Cross-Pollination

The phenotype and genotype of the hybrids resulting from the cross-pollination between pink flowers (determined by the (R) gene) and red flowers and white flowers (determined by the (g) gene) can be determined using the principles of Mendelian genetics.

When it comes to flower color, the (R) gene is dominant over the (g) gene. This means that if a plant has at least one copy of the (R) gene, it will display the red color phenotype. On the other hand, the (g) gene is recessive, and plants need to have two copies of the (g) gene to display the white color phenotype.

Based on the information provided, the pink flowers are the result of heterozygosity, meaning they have one copy of the (R) gene and one copy of the (g) gene. When these pink flowers are pollinated with pollen from red flowers, the possible genotypes and phenotypes of the resulting hybrids can be determined.

Let's consider the possible combinations:

1. Pink flower (Rg) x Red flower (RR): - The pink flower (Rg) has one copy of the (R) gene and one copy of the (g) gene. - The red flower (RR) has two copies of the (R) gene. - The possible genotypes of the hybrids will be (RR) and (Rg), with the phenotypes being red and pink, respectively.

2. Pink flower (Rg) x Red flower (Rg): - Both the pink flower (Rg) and the red flower (Rg) have one copy of the (R) gene and one copy of the (g) gene. - The possible genotypes of the hybrids will be (RR), (Rg), and (gg), with the phenotypes being red, pink, and white, respectively.

Therefore, the hybrids resulting from the cross-pollination between pink flowers and red flowers can have the phenotypes of red, pink, and white, depending on the specific genotypes of the parent plants involved in the cross-pollination.

Please note that the information provided is based on the principles of Mendelian genetics and assumes that flower color is determined solely by the (R) and (g) genes. Other genetic factors or modifiers may also influence flower color in real-world scenarios.

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