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Multifactorial Inheritance Quiz

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Questions and Answers

What is a multifactorial trait?

A trait influenced only by environmental factors

A trait influenced by both genetic and environmental factors (correct)

A trait determined solely by genetic factors

A trait influenced by a single gene

What is heritability in the context of multifactorial inheritance?

The likelihood of a trait being passed from one generation to the next

The measure of how common a trait is in a population

The proportion of individual differences in a trait due to genetic differences (correct)

The total influence of environmental factors on a trait

Which gene is involved in familial hypercholesterolemia?

Hemoglobin gene

LDL receptor gene (correct)

Thyroid receptor gene

Insulin receptor gene

What is the role of twin and adoption studies in studying multifactorial traits?

<p>To differentiate between heredity and environmental influences</p> Signup and view all the answers

What do many multifactorial traits show in terms of distribution?

<p>A normal distribution (bell-shaped curve)</p> Signup and view all the answers

Study Notes

Multifactorial Traits

A multifactorial trait is a characteristic influenced by both genetic and environmental factors, resulting in a complex interplay between multiple genes and environmental influences.

Heritability

Heritability, in the context of multifactorial inheritance, refers to the proportion of variation in a trait that can be attributed to genetic differences between individuals.

Familial Hypercholesterolemia

Familial hypercholesterolemia is a multifactorial trait caused by mutations in the LDLR gene, leading to extremely high levels of low-density lipoprotein (LDL) cholesterol.

Twin and Adoption Studies

Twin and adoption studies are used to study multifactorial traits, allowing researchers to distinguish between the effects of genetics and environment on trait variation.

Distribution of Multifactorial Traits

Many multifactorial traits exhibit a continuous distribution, following a bell-shaped curve, indicating that the majority of individuals will have average values, while fewer individuals will have extreme values.

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Description

Test your understanding of multifactorial inheritance with this quiz! Explore terms such as multifactorial trait, recurrence risk, heritability, threshold of liability, and concordant/discordant trait. Evaluate your knowledge of the five criteria for recurrence risk, indicating multifactorial inheritance in traits.