Types of Inheritance

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 traits.

Front

What color flowers result from a cross between a red flower (RR) and a white flower (WW) in snapdragons?

Back

Pink (RW) flowers are produced due to incomplete dominance.

Front

What is codominance?

Back

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.

Front

What is an example of codominance in chickens?

Back

In chickens, black and white feather colors are codominant; heterozygous chickens (BW) have speckled black and white feathers.

Front

What does it mean when alleles are expressed equally?

Back

This indicates codominance, where both alleles contribute to the phenotype without blending.

Front

What is the result of a cross between two heterozygous individuals for a trait showing incomplete dominance?

Back

The offspring will show a phenotypic ratio of 1:2:1 (one homozygous dominant, two heterozygous, one homozygous recessive).

Front

What is a polygenic trait?

Back

A trait that is controlled by multiple genes, leading to a wide range of phenotypes, such as skin color or height.

Front

What is the difference between dominant and recessive alleles?

Back

Dominant alleles mask the effect of recessive alleles in heterozygous conditions, determining the phenotype.

Front

What is an example of a trait that shows multiple alleles?

Back

The ABO blood group system in humans, where three alleles (IA, IB, i) determine blood type.

Front

What is the phenotypic ratio for a monohybrid cross of two heterozygous parents?

Back

The phenotypic ratio is typically 3:1 for dominant to recessive traits.