Non-Mendelian Genetics FA #1

Front

What is codominance in genetics?

Back

Codominance is a form of inheritance where both alleles in a heterozygote are fully expressed, resulting in offspring with a phenotype that is neither dominant nor recessive. An example is the speckled coloration in carnations.

Front

What are the genotypes for red, white, and speckled carnations?

Back

Red = RR, White = WW, Speckled = RW.

Front

What type of inheritance occurs when two alleles blend together in the phenotype?

Back

This is known as incomplete dominance.

Front

What is the phenotype of heterozygous chickens with one allele for black feathers and another for white feathers?

Back

The phenotype will be speckled black and white feathers.

Front

What is the genotype of a person with type A blood whose father has type O blood?

Back

The genotype is AO.

Front

Define incomplete dominance in genetics.

Back

Incomplete dominance is a genetic situation in which one allele does not completely dominate another allele, resulting in a new phenotype that is a blend of the two.

Front

What is the difference between codominance and incomplete dominance?

Back

In codominance, both alleles are fully expressed in the phenotype, while in incomplete dominance, the phenotype is a blend of the two alleles.

Front

Provide an example of codominance in animals.

Back

An example of codominance in animals is the ABO blood group system in humans, where both A and B alleles are expressed in individuals with AB blood type.

Front

What is the significance of the ABO blood group system in genetics?

Back

The ABO blood group system illustrates the concepts of codominance and multiple alleles, as there are three alleles (A, B, O) that determine blood type.

Front

How can you determine the genotype of an individual with a dominant phenotype?

Back

To determine the genotype of an individual with a dominant phenotype, a test cross can be performed with a homozygous recessive individual.