Question

Assertion : Recessive trait can only be expressed in homozygous
condition.
Reason : Dominant trait cannot be expressed in hetrozygous condition.
a) (A) is incorrect and (R) is correct
a) (A) is correct and (R) is incorrect
c) Both (A) and (R) are correct but (R) is not the correct explanation of
(A)
d) Both (A) and (R) are correct and (R) is the correct explanation of (A)

Answer 1

Answer:

b). (A) is correct and (R) is incorrect.

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Answer 2

Hey there,

Here's the answer to your question:

b) (A) is correct and (R) is incorrect.

Explanation:

If we take an example of a simple monohybrid cross, between two genetically dissimilar plants in terms of height, we will see that the genotypic ratio of the progenies produced are:

TT : Tt : tt

1    :  2  : 1

From this, progenies having homozygous condition with a pair of dominant alleles (T, T) and progenies having heterozygous condition with one dominant and one recessive allele (T, t) were all tall.

Only progenies having heterozygous condition with a pair of recessive alleles (t, t) were short.

Therefore, we can infer from the above that Recessive traits are expressed only in homozygous condition, while Dominant traits can be expressed in homozygous as well as heterozygous conditions.

Hence, option b) is correct.

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