PATHOLOGY

PATHOLOGY MCQ

GENETICS AND DISEASE

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
This is when there is a third, intermediate form for a trait.
A
Incomplete dominance
B
Complete Dominance
C
Polygenic Inheritance
D
Pedigree
Explanation: 

Detailed explanation-1: -Incomplete dominance is a form of intermediate inheritance in which one allele for a specific trait is not completely expressed over its paired allele. This results in a third phenotype in which the expressed physical trait is a combination of the phenotypes of both alleles.

Detailed explanation-2: -This intermediate phenotype is a demonstration of partial or incomplete dominance. When partial dominance occurs, a range of phenotypes is usually observed among the offspring. Although the offspring may show a variety of phenotypes, each one will lie along a continuum bracketed by the homozygous parental phenotypes.

Detailed explanation-3: -With incomplete dominance, a cross between organisms with two different phenotypes produces offspring with a third phenotype that is a blending of the parental traits. It’s like mixing paints, red + white will make pink.

Detailed explanation-4: -Incomplete Dominance Examples Apart from plants, incomplete dominance also occurs in animals and humans. For example, hair color, eye color, and skin color traits are determined by multiple alleles in humans.

Detailed explanation-5: -Incomplete dominance occurs when neither trait is truly dominant over the other. This means that both traits can be expressed in the same regions, resulting a blending of two phenotypes. If a white and black dog produce a gray offspring, this is an example of incomplete dominance.

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