NEET BIOLOGY

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GENETICS AND EVOLUTION

GENETIC BASIS OF INHERITANCE

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
In humans having two eye brows is a completely dominant trait, the recessive trait is expressed as having a single connected eyebrow. If a two parents who are heterozygous for the eyebrow trait had an offspring what is the probability that their child would express the recessive phenotype?
A
Their offspring has a 0% chance of expressing the recessive phenotype.
B
Their offspring has a 25% chance of expressing the recessive phenotype.
C
Their offspring has a 75% chance of expressing the recessive phenotype.
D
Their offspring has a 100% chance of expressing the recessive phenotype.
Explanation: 

Detailed explanation-1: -Definition. Codominance, as it relates to genetics, refers to a type of inheritance in which two versions (alleles) of the same gene are expressed separately to yield different traits in an individual.

Detailed explanation-2: -If both alleles are dominant, it is called codominance?. The resulting characteristic is due to both alleles being expressed equally. An example of this is the blood group AB which is the result of codominance of the A and B dominant alleles.

Detailed explanation-3: -As mentioned earlier, incomplete dominance is a partial dominance, meaning the phenotype is in between the genotype dominant and recessive alleles. In the above example, the resulting offspring has a pink color trait despite the dominant red color and white color trait due to incomplete dominance.

Detailed explanation-4: -Codominance. As opposed to partial dominance, codominance occurs when the phenotypes of both parents are simultaneously expressed in the same offspring organism.

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