Incomplete Dominance and Codominance

Front

What is incomplete dominance?

Back

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 parental traits.

Front

What is codominance?

Back

A genetic scenario where both alleles in a heterozygote are fully expressed, resulting in offspring with a phenotype that shows both traits simultaneously.

Front

In a Punnett square, what does a 50% chance of gray offspring indicate in incomplete dominance?

Back

It indicates that half of the offspring will exhibit the intermediate phenotype, which in this case is gray.

Front

What phenotype does a cow with brown and white spots represent?

Back

It represents codominance, where both colors are expressed equally.

Front

If a red flowered plant (RR) is crossed with a white flowered plant (WW) and shows incomplete dominance, what will the offspring look like?

Back

All offspring will have pink flowers (RW), which is the intermediate phenotype.

Tags

NGSS.HS-LS3-1

Front

What is the expected phenotype ratio in a cross showing incomplete dominance?

Back

The expected phenotype ratio is typically 1:2:1, representing the three possible phenotypes.

Front

How can you identify codominance in a genetic cross?

Back

By observing that both parental traits appear in the offspring without blending, such as in the case of AB blood type.

Front

What is the significance of a Punnett square in genetics?

Back

A Punnett square is a tool used to predict the genotypes and phenotypes of offspring from a genetic cross.

Front

What does the term 'phenotype' refer to?

Back

Phenotype refers to the observable physical or biochemical characteristics of an organism, as determined by both genetic makeup and environmental influences.

Front

What is the difference between genotype and phenotype?

Back

Genotype refers to the genetic constitution of an organism, while phenotype refers to the observable traits expressed by that genotype.