Question

При скрещивании растений земляники с красными и белыми плодами 75% растений оказались красными.Определить доминантно- рецессивный признак,генотипы и фенотипы растений,генотипы и фенотипы гибридов.СРОЧНО ПОЖАЛУУУЙСТА

Answer 1

А-красный
а-белый
Скрещивали Аа (гетерозигота),при этом,у растения с красными плодами проявился доминатный признак,а у растения с белыми плодами рецессивный признак.В результате скрещивания гетерозигот и получится расщепление 3:1 или 75% на 25% красных к белым.
Р Аа   * Аа
G А  а  А  а
F АА,Аа,Аа,аа
генотипы: 1 АА-гомозигота по доминанту,2-Аа-гетерозигота, 1-аа-гомозигота по рецессиву.

Answer 2

Dominant and Recessive Trait

When crossing strawberry plants with red and white fruits, 75% of the plants had red fruits. To determine the dominant and recessive trait, we can analyze the phenotypes and genotypes of the plants.

The dominant trait is the one that is expressed in the offspring when present. In this case, the dominant trait is the red fruit color, as 75% of the plants had red fruits. The recessive trait is the one that is not expressed when the dominant trait is present. In this case, the recessive trait is the white fruit color, as only 25% of the plants had white fruits.

Genotypes and Phenotypes of Plants

To determine the genotypes and phenotypes of the plants, we need to understand the inheritance pattern of the trait. If the trait follows a simple Mendelian inheritance, where one gene controls the trait, we can use the Punnett square to determine the genotypes and phenotypes.

However, without additional information about the specific inheritance pattern and the genotypes of the parent plants, it is not possible to determine the exact genotypes and phenotypes of the plants in this scenario.

Genotypes and Phenotypes of Hybrids

When crossing plants with different traits, the offspring are called hybrids. In this case, the hybrids would be the plants with red fruits resulting from the cross between plants with red and white fruits.

Again, without additional information about the specific genotypes of the parent plants, it is not possible to determine the exact genotypes and phenotypes of the hybrids in this scenario.

Please note that the information provided is based on the assumption of simple Mendelian inheritance. If there are additional factors involved, such as multiple genes or incomplete dominance, the analysis would be more complex.

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