AP BIOLOGY

EVOLUTION

EVOLUTION OF A POPULATION

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Traits, such as human height, that are controlled by more than one gene are known as
A
single-gene traits.
B
polygenic traits.
C
recessive traits.
D
dominant traits.
Explanation: 

Detailed explanation-1: -A polygenic trait is a characteristic, such as height or skin color, that is influenced by two or more genes. Because multiple genes are involved, polygenic traits do not follow the patterns of Mendelian inheritance . Many polygenic traits are also influenced by the environment and are called multifactorial.

Detailed explanation-2: -Human height is a polygenic trait, influenced by a large number of genomic loci.

Detailed explanation-3: -In humans, height, skin color, hair color, and eye color are examples of polygenic traits. Type-2 diabetes, coronary heart disease, cancer, and arthritis are also deemed polygenic. However, these conditions are not just genetic since polygenes can be influenced by environmental factors.

Detailed explanation-4: -Polygenic traits are traits that are controlled by multiple genes instead of just one. The genes that control them may be located near each other or even on separate chromosomes. Because multiple genes are involved, polygenic traits do not follow Mendel’s pattern of inheritance.

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