Question

У пшеницы ген карликового роста доминирует над геном нормального роста. Определите какое потомство будет от: 1) Скрещивания гетерозиготной карликовой пшеницы с нормальной пшеницей. 2)скрещивания гомозигозотной карликовой пшеницы с карликовой пшеницей.Спасибо.

Answer 1

1) P: Aa x aa                   A- карликовость, a- нормальный рост
F1: Aa aa
2) P: AA x Aa
F1: AA Aa

Answer 2

1) 
Р   Аа        х         аа
Г   А       а             а
F       Aa            aa       
(карликовая и нормальная пшеница)
2)
Р  АА        х         Аа
Г  А                А         а
F      АА            Аа
( обе карликовые пшеницы)

Answer 3

Inheritance of Dwarf Wheat Genes

When it comes to the inheritance of dwarf wheat genes, it is important to understand the concept of dominance. Dominance refers to the relationship between different alleles (alternative forms of a gene) at a specific gene locus. In this case, we have a gene for dwarfism (carrying the dwarf allele) and a gene for normal height (carrying the normal allele).

1) Crossing Heterozygous Dwarf Wheat with Normal Wheat:

If we cross a heterozygous dwarf wheat (carrying one dwarf allele and one normal allele) with normal wheat (carrying two normal alleles), the outcome will depend on the dominance relationship between the alleles.

- If the dwarf allele is dominant over the normal allele, then all the offspring will be dwarfs, as they will inherit one dwarf allele from the heterozygous dwarf parent and one normal allele from the normal parent. - If the normal allele is dominant over the dwarf allele, then all the offspring will be normal height, as they will inherit one normal allele from each parent.

To determine the dominance relationship between the dwarf and normal alleles, we would need more information about the specific genes involved. Without this information, it is not possible to definitively determine the outcome of the cross.

2) Crossing Homozygous Dwarf Wheat with Dwarf Wheat:

If we cross a homozygous dwarf wheat (carrying two dwarf alleles) with another dwarf wheat (also carrying two dwarf alleles), all the offspring will be dwarfs. This is because both parents only have dwarf alleles to pass on to their offspring.

It is important to note that the specific genetic mechanisms and dominance relationships can vary depending on the specific genes involved in dwarfism in wheat. Without more information about the specific genes and their dominance relationships, it is not possible to provide a definitive answer.

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