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Genetics and Genetic Engineering: Additive Genes and Pigmentation

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Genetics and Genetic Engineering: Additive Genes and Pigmentation

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Questions and Answers

What is polygenic inheritance?

Inheritance controlled by a single gene

Inheritance of a single characteristic

Inheritance influenced by multiple genes (correct)

Inheritance controlled by environmental factors

What type of variation is seen in quantitative genetics?

Continuous variation (correct)

Discrete variation

Discontinuous variation

Qualitative variation

What is the focus of quantitative genetics?

Populations (correct)

Individual organisms

Genes

Species

How is quantitative genetics analyzed?

By statistical analysis of mean and standard deviation (C) Signup and view all the answers

What is the effect of environment on quantitative genetics?

Greatly affected (A) Signup and view all the answers

How does polygenic control differ from single gene effect?

Polygenic control involves multiple genes, single gene effect involves one gene (A) Signup and view all the answers

What is the effect of dominant alleles on the degree of color in polygenic inheritance?

Increase the degree of color (B) Signup and view all the answers

What is the ratio of black to dark to intermediate to white phenotypes in the F2 generation?

1:4:6:4 (C) Signup and view all the answers

What is the challenge in calculating the phenotypic ratio in polygenic inheritance?

Many genes are involved (D) Signup and view all the answers

What is the genotype of the F1 generation offspring in the cross between a black and a white individual?

AaBb (B) Signup and view all the answers

What is the probability of a black phenotype in the F2 generation?

1/16 (C) Signup and view all the answers

What type of inheritance is described in the text?

Polygenic inheritance (B) Signup and view all the answers

What is the ratio of individuals in F2 that resemble either parent in a polygenic trait?

1/4n (A) Signup and view all the answers

If a trait is controlled by 5 pairs of genes, what is the ratio of individuals in F2 that resemble either parent?

1/1024 (A) Signup and view all the answers