2GT3 Chapter 4 Part 2 (T/F)

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In Drosophila, the white-eye trait follows the typical Mendelian inheritance pattern observed in monohybrid reciprocal crosses.

False

In humans, males can be homozygous for X-linked genes.

False

The crisscross pattern of inheritance involves passing X-linked traits from heterozygous mothers to all sons.

True

Sex-limited inheritance occurs when the expression of a phenotype is restricted to one sex only.

True Signup and view all the answers

The phenotype in females with the genotype 'Hh' for hen-feathered trait will always be hen-feathered.

False Signup and view all the answers

In X-linkage, genes are present on both the X and Y chromosomes.

False Signup and view all the answers

X-linkage inheritance patterns can modify Mendelian ratios due to gene presence on the Y chromosome.

False Signup and view all the answers

The white eye mutation in Drosophila exhibits X-linkage, with red eyes being the wild-type.

True Signup and view all the answers

Marfan syndrome is caused by a mutation in a gene encoding for muscle tissue fibrillin.

False Signup and view all the answers

Porphyria variegata is an autosomal recessive disorder related to lipid metabolism.

False Signup and view all the answers

In dihybrid crosses, the classic F2 ratio is always 9:3:3:1.

False Signup and view all the answers

Epistasis combines one or more of the four phenotypic categories in exactly three different ways.

False Signup and view all the answers

When gene interaction controls phenotypic variation, the final ratio in dihybrid crosses can be expressed in sixteenths.

True Signup and view all the answers

Complementation analysis is used to determine if mutations causing similar phenotypes are always in the same gene.

False Signup and view all the answers

Complementation Example: In Drosophila, two true-breeding strains with wingless phenotypes must have mutations in the same gene.

False Signup and view all the answers

Incomplete penetrance means that all individuals with the disease-causing mutation will develop the clinical symptoms of the disease.

False Signup and view all the answers

Expressivity can only be measured qualitatively, not quantitatively.

False Signup and view all the answers

Environmental factors such as diet, temperature, and light cycles do not have any impact on gene expression.

False Signup and view all the answers

Reduction in phenotypic variation in a controlled environment suggests that genes have a greater influence on phenotype than the environment.

False Signup and view all the answers

Complete penetrance means that all individuals with the disease-causing mutation will develop the clinical symptoms of the disease.

True Signup and view all the answers

Two modes of inheritance can alter the 3:1 monohybrid ratio to a 9:3:3:1 dihybrid ratio.

True Signup and view all the answers

2GT3 Chapter 4 Part 2 (T/F)

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Questions and Answers

In Drosophila, the white-eye trait follows the typical Mendelian inheritance pattern observed in monohybrid reciprocal crosses.

In humans, males can be homozygous for X-linked genes.

The crisscross pattern of inheritance involves passing X-linked traits from heterozygous mothers to all sons.

Sex-limited inheritance occurs when the expression of a phenotype is restricted to one sex only.

The phenotype in females with the genotype 'Hh' for hen-feathered trait will always be hen-feathered.

In X-linkage, genes are present on both the X and Y chromosomes.

X-linkage inheritance patterns can modify Mendelian ratios due to gene presence on the Y chromosome.

The white eye mutation in Drosophila exhibits X-linkage, with red eyes being the wild-type.

Marfan syndrome is caused by a mutation in a gene encoding for muscle tissue fibrillin.

Porphyria variegata is an autosomal recessive disorder related to lipid metabolism.

In dihybrid crosses, the classic F2 ratio is always 9:3:3:1.

Epistasis combines one or more of the four phenotypic categories in exactly three different ways.

When gene interaction controls phenotypic variation, the final ratio in dihybrid crosses can be expressed in sixteenths.

Complementation analysis is used to determine if mutations causing similar phenotypes are always in the same gene.

Complementation Example: In Drosophila, two true-breeding strains with wingless phenotypes must have mutations in the same gene.

Incomplete penetrance means that all individuals with the disease-causing mutation will develop the clinical symptoms of the disease.

Expressivity can only be measured qualitatively, not quantitatively.

Environmental factors such as diet, temperature, and light cycles do not have any impact on gene expression.

Reduction in phenotypic variation in a controlled environment suggests that genes have a greater influence on phenotype than the environment.

Complete penetrance means that all individuals with the disease-causing mutation will develop the clinical symptoms of the disease.

Two modes of inheritance can alter the 3:1 monohybrid ratio to a 9:3:3:1 dihybrid ratio.

Epigenesis states that each gene must carry out its activities in a random fashion.

Complementation is an example of pleiotropy.

X-linkage in humans can result in sex-limited inheritance.

Genetic maternal effect is an example of gene interaction.

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