Dental Admissions Test (DAT) Practice Test

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Prepare for the Dental Admissions Test (DAT) with our comprehensive practice test. Study effectively with flashcards and multiple-choice questions, each with detailed hints and explanations. Get ready to ace your exam and secure your future in dentistry!

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What biological concept is illustrated by the genes for hair texture producing straight and curly hair independently, resulting in wavy hair in humans?

Incomplete Dominance
Electrophoresis
Epistasis
Intramembranous Ossification

The correct answer is: Incomplete Dominance

These other options are incorrect because they do not refer to the specific biological concept being asked by the question. B Electrophoresis is a laboratory technique used to separate and analyze DNA fragments based on their size and charge. C: Epistasis refers to the interaction between different genes that can affect the expression of a trait. D: Intramembranous Ossification is the process of bone formation in which mesenchymal cells differentiate into osteoblasts to create new bone tissue. This does not directly relate to the production of straight, curly, or wavy hair. Incomplete dominance, also known as partial dominance, is a biological concept in genetics where one allele for a specific trait is not completely dominant over the other allele. This results in an intermediate phenotype where both alleles are expressed, such as wavy hair in humans. This can occur when the heterozygote, or individual with two different alleles, produces a different phenotype than either homozygous genotype. In this case, the genes for hair texture are independently expressed, leading to the combination of straight and curly hair resulting in wavy hair.