Question

У томатов ген обуславливающий нормальный рост доминирует над геном карликовости ,какое потомство можно ожидать от скрещивания гибридов первого поколения между собой? 2)у человека ген вызывающий одну из форм наследственной глухонемоты рецессивен по отношению к гену нормального слуха .Какое потомство можно ожидать от брака гомозиготного

Answer 1

Все, надеюсь помогла 

Answer 2

Tomato Genetics and Hybridization

When it comes to tomatoes, the gene that determines normal growth (tall stature) is dominant over the gene for dwarfism. This means that the gene for normal growth will mask the expression of the dwarfism gene when present in the hybrid offspring.

So, when two hybrid plants of the first generation (F1) are crossed with each other, we can expect a mixture of offspring with both normal and dwarf phenotypes. The ratio of normal to dwarf plants will depend on the specific genetic makeup of the hybrid parents.

However, it's important to note that without specific information about the genetic makeup of the hybrid parents, it is difficult to predict the exact ratio of normal to dwarf offspring. The inheritance of traits in plants can be complex, and additional genes may also influence the expression of height in tomatoes.

Inheritance of Deafness in Humans

In humans, the gene that causes one form of inherited deafness is recessive to the gene for normal hearing. This means that an individual must inherit two copies of the deafness-causing gene (one from each parent) to exhibit the deafness phenotype.

If two individuals who are both homozygous (having two copies) for the deafness-causing gene (referred to as "g" for simplicity) have a child, the child will also be homozygous for the deafness-causing gene. As a result, the child is expected to have the deafness phenotype.

The possible genotypes and phenotypes of the offspring from this marriage can be represented as follows:

- Both parents: gg (homozygous for the deafness-causing gene) - Possible offspring: gg (homozygous for the deafness-causing gene)

Therefore, in this specific scenario, the expected outcome of the marriage between two individuals who are homozygous for the deafness-causing gene is that all their offspring will have the deafness phenotype.