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Heritability is a measure of the degree to which the phenotypic variation of a given trait is due to genetic factors.

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Describe the value of using twins in the study of questions relating to the relative impact of heredity versus environment.

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Monozygotic twins are derived from the s...

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Provide a brief definition of the terms additive variance,dominance variance,and interactive variance.

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Additive variance results from the avera...

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Polygenes are involved in determining continuously varying or multiple-factor traits.

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Name the three components of phenotypic variance.

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environmental variance (VE),ge...

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Name two human traits that would be expected to have high concordance.

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eye color ...

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The 9:3:3:1 ratio is typical of a dihybrid cross in which complete dominance and independent assortment occur.What is the dihybrid ratio with independent assortment of polygenes?

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What are QTLs and RFLPs?

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QTLs are quantitative trait lo...

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What is meant by the term heritability? Describe the components of heritability and provide a brief explanation of each.Of what interest is heritability to animal and plant breeders?

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Heritability refers to the degree to whi...

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We often refer to the host of genetic factors in the genome that have an influence on a particular gene's expression as its genetic background.What influence does genetic background have over the phenotype of the organism?

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Genetic background may have a ...

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Bell-shaped distributions produced by plotting results of F₂ and F₃ crosses are typical of which type of inheritance?


A) multiple-factor inheritance
B) alternation of generations
C) codominance
D) incomplete dominance
E) hemizygosity

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Interpret the meaning of an H² (broad-sense heritability)value that approaches 1.0.

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Almost all the pheno...

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