Question

10 when is a recessive trait capable of expressing itself? Write its expression with respect to the height of plant (genotype

Answer 1

Answer:

recessive trait can express itself only in presence of another recessive trait

Explanation:

tt = recessive trait

TT= dominant trait

Tt= dominant trait

Answer 2

Complete and Correct Question:

When is a recessive trait capable of expressing itself?

1. Heterozygous Condition

2. Homozygous Condition

3. F₁ generation

Write its expression for the height of the plant (genotype).

Answer:

Option 2. Homozygous condition

A recessive trait is capable of expressing itself in "homozygous conditions".

The genotypic expression for the height of the plant for the homozygous recessive trait would be tt (dwarf).

Explanation:

• Mendel's law of inheritance states that the dominant factor suppresses the traits of the other factor and can express itself fully.
• Both dominant and recessive alleles are present in the heterozygous condition, and the dominant allele obscures the expression of the recessive allele.
• Therefore, only in homozygous conditions of any generation can recessive alleles be expressed.

• A recessive gene can only express itself when both parents are homozygous.  A recessive gene is one whose effects are masked or dominated when a dominant gene is present.
• This is because recessive genes are only expressed when recessive alleles are present; otherwise, the gene's effect is masked.

• Both homozygous and heterozygous conditions can result in the expression of dominant alleles.

• For example, the character plant height (T) exhibits a tall phenotype when TT (Tallness) and Tt (Tallness) are combined, whereas tt (Dwarfness) by itself can exhibit a dwarf phenotype.

• To exhibit a recessive trait, a plant must possess two copies of the recessive allele. A lowercase letter (in this case, t instead of T) is used to identify recessive alleles.

• A recessive trait can only be displayed by those with a tt genotype; Consequently, for an offspring to exhibit a recessive trait, each parent must provide one recessive allele.

• If we now examine the options, option 1 is a heterozygous condition. In a heterozygous condition, recessive genes cannot express themselves because the dominant gene will conceal/mask its effect, so this option is incorrect. As a result, this choice is eliminated.

• Choosing option 2, which is the condition of homozygosity. Because there is no dominant allele to cover up the effect of the recessive allele in a homozygous condition, it can express itself. As a result, this is the best and most appropriate choice.

• Now moving to option 3, which is F₁ generation. As per the law of dominance, the dominant trait is expressed in F₁ generation by suppressing the recessive trait. Thus, this choice is also incorrect and eliminated.

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