Genetics: Mendel's Laws

Front

What is a gene?

Back

A piece of DNA on a chromosome that codes for a trait.

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Which of the following is a genetic trait?

Back

Eye color.

Front

What does it mean if a trait is dominant?

Back

A dominant trait is one that is expressed in the phenotype even if only one copy of the allele is present.

Front

What does it mean if a trait is recessive?

Back

A recessive trait is only expressed in the phenotype if two copies of the allele are present.

Front

What is homozygous?

Back

An organism is homozygous for a trait if it has two identical alleles for that trait.

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What is heterozygous?

Back

An organism is heterozygous for a trait if it has two different alleles for that trait.

Front

What is a Punnett square?

Back

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

Front

What does the notation 'T' represent in genetics?

Back

'T' typically represents a dominant allele for a trait.

Front

What does the notation 't' represent in genetics?

Back

't' typically represents a recessive allele for a trait.

Front

What is the genotype?

Back

The genotype is the genetic makeup of an organism, represented by the alleles it possesses.