Genetics and Punnett Squares

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.

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What is a recessive trait?

Back

A recessive trait is a genetic trait that is only expressed in the phenotype when two copies of the allele are present.

Front

How are dominant traits represented in genetic notation?

Back

Dominant traits are represented by uppercase letters.

Front

How are recessive traits represented in genetic notation?

Back

Recessive traits are represented by lowercase letters.

Front

What does the term 'homozygous' mean?

Back

Homozygous refers to having two identical alleles for a particular gene.

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What does the term 'heterozygous' mean?

Back

Heterozygous refers to having two different alleles for a particular gene.

Front

What is a phenotype?

Back

A phenotype is the observable physical or biochemical characteristics of an organism, determined by both genetic makeup and environmental influences.

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What is a genotype?

Back

A genotype is the genetic constitution of an individual, specifically the alleles present for a particular gene.

Front

What is a Punnett square used for?

Back

A Punnett square is a diagram used to predict the outcome of a genetic cross by showing the possible combinations of alleles.

Front

What does a 1:2:1 ratio in a Punnett square indicate?

Back

A 1:2:1 ratio indicates that there is one homozygous dominant, two heterozygous, and one homozygous recessive offspring expected from a cross.