Heredity and Punnett Squares

Front

What is a dominant trait in Mendelian Genetics?

Back

A trait or characteristic that will appear in the offspring if one or both of the parents contributes it.

Front

What is the allele combination that represents homozygous dominant?

Back

AA

Front

What is a Punnett Square used for in Mendelian Genetics?

Back

A Punnett Square allows the prediction of the percentages or probability of phenotypes in the offspring from known genotypes.

Front

If both parents are heterozygous for brown hair (dominant) and blond hair (recessive), what is the probability that the offspring will have brown hair?

Back

75%.

Front

If one parent is homozygous dominant for brown hair and the other is heterozygous, what is the probability that the offspring will have brown hair?

Back

100%.

Front

Define homozygous dominant.

Back

An organism with two identical dominant alleles for a trait (e.g., AA).

Front

Define heterozygous.

Back

An organism with two different alleles for a trait (e.g., Aa).

Front

What does a recessive trait mean?

Back

A trait that will only appear in the offspring if both alleles are recessive.

Front

What is the purpose of using a Punnett Square?

Back

To predict the genetic makeup of offspring based on parental genotypes.

Front

What is the genotype of an organism with brown hair that is heterozygous?

Back

Aa.