In Preparation for Unit Exam on Inheritance

Front

What is an allele?

Back

An allele is a different version of a gene that can code for variations in traits, such as blue eyes versus green eyes.

Front

What does it mean for alleles to be codominant?

Back

Codominance occurs when both alleles in a heterozygous individual contribute equally to the phenotype, such as in the case of A and B blood antigens.

Front

What is a recessive trait?

Back

A recessive trait is a trait that is expressed only when two recessive alleles are present, such as type O blood which has no antigens.

Front

How can you determine the possible blood types of offspring from two parents?

Back

You can use a Punnett square to predict the genotypes and phenotypes of offspring based on the alleles of the parents.

Front

What is a Punnett square?

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 fraction of offspring will have a specific trait based on a Punnett square?

Back

The fraction can be determined by counting the number of squares representing the desired trait and dividing by the total number of squares.

Front

What is incomplete dominance?

Back

Incomplete dominance is a genetic situation where one allele does not completely dominate another, resulting in a phenotype that is a blend of both traits.

Front

If a red flowered plant (RR) and a white flowered plant (WW) are crossed, what will the offspring look like?

Back

All offspring will have pink flowers (RW) due to incomplete dominance.

Front

What is the expected phenotype ratio in a dihybrid cross?

Back

The expected phenotype ratio in a dihybrid cross is typically 9:3:3:1.

Front

What is the significance of homozygous and heterozygous genotypes?

Back

Homozygous genotypes have two identical alleles for a trait, while heterozygous genotypes have two different alleles.