Exploring Genes and Alleles in PTC Taste Sensitivity

What does PTC stand for?

• Potassium Tetrachloride

• Phenyltrichloroethane

• Potassium Thiocyanate

• Phenylthiocarbamide

How is PTC taste sensitivity used in genetic classes?

• To explore the structure of DNA

• To demonstrate Mendelian inheritance

• To show the complexity of eye color genetics

• To illustrate the taste of bitterness

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How many chromosomes do humans have?

• 92

• 46

• 23

• 44

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What is an allele?

• A type of DNA sequence

• A type of gene

• A variant of a chromosome

• A variant of a gene

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What does a dominant allele mean?

• It is always expressed in the phenotype

• It is never expressed in the phenotype

• It is only expressed if paired with a similar allele

• It has no impact on the phenotype

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What is a phenotype?

• A genetic makeup

• A physical characteristic

• A chromosome pair

• A type of allele

Which genotype combination allows a person to taste PTC?

• TT

• Both TT and Tt

• Tt

• tt

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What can be inferred if both parents can taste PTC but their child cannot?

• Both parents are TT

• One parent is TT and the other is Tt

• It's impossible to determine

• Both parents are Tt

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What is the role of Punnett squares in genetics?

• To determine DNA structure

• To predict genotype and phenotype probabilities

• To map chromosomes

• To identify dominant and recessive alleles

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Why might a dominant trait not be more common in a population?

• The dominant allele is more rare

• Dominant traits are less advantageous

• Recessive alleles mutate faster

• Dominant alleles are always more common

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