Genetics and Punnett Squares (9.19)

Front

What is a dominant trait?

Back

A dominant trait is a genetic trait that is expressed in the phenotype even when only one copy of the allele is present. For example, yellow pea seeds are a dominant trait.

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What is a heterozygous genotype?

Back

A heterozygous genotype consists of two different alleles for a particular gene, such as Bb.

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What is the phenotype for a recessive trait?

Back

The phenotype for a recessive trait is the observable characteristic that is expressed only when two copies of the recessive allele are present, such as blue eyes.

Front

What is a gene?

Back

A gene is a section of DNA that determines a specific trait.

Front

What does a Punnett square do?

Back

A Punnett square is a tool used to predict the probability of certain traits in offspring based on the genetic makeup of the parents.

Front

What is the probability of offspring having a dominant trait if both parents are homozygous recessive?

Back

0%.

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What does the term 'allele' mean?

Back

An allele is a variant form of a gene that can produce different traits.

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What is the difference between genotype and phenotype?

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Genotype refers to the genetic makeup of an organism, while phenotype refers to the observable characteristics.

Front

What does homozygous mean?

Back

Homozygous refers to having two identical alleles for a particular gene, such as BB or bb.

Front

What is the significance of the letter 'G' in genetics?

Back

In genetics, letters like 'G' represent alleles, where 'G' might indicate a dominant trait, such as green skin.