Applied- Codominance Non-Mendelian Traits

Front

What is a genotype?

Back

A genotype is the genetic makeup of an organism, represented by the alleles it possesses (e.g., Aa, DD, Bb).

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What is a phenotype?

Back

A phenotype is the observable physical or biochemical characteristics of an organism, determined by its genotype and environment.

Front

What is codominance?

Back

Codominance is a type of inheritance where both alleles in a heterozygous organism are fully expressed, resulting in offspring with a phenotype that is neither dominant nor recessive (e.g., black and white checkered chickens).

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What is incomplete dominance?

Back

Incomplete dominance is a type of inheritance where the phenotype of a heterozygote is intermediate between the phenotypes of the two homozygotes (e.g., red and white flowers producing pink flowers).

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What is the expected phenotype ratio in a codominance cross?

Back

In a typical codominance cross, the expected phenotype ratio is 1:2:1 for the three possible phenotypes.

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What is the expected genotype ratio in a codominance cross?

Back

In a typical codominance cross, the expected genotype ratio is also 1:2:1 for the three possible genotypes.

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If a red cow (RR) is crossed with a white cow (WW), what will be the phenotype of the offspring?

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The offspring will be roan (RW), showing both red and white fur due to codominance.

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What percentage of offspring will express the same genotype as their parents in a codominance cross?

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In a codominance cross between two heterozygous parents, 50% of the offspring will express the same genotype as their parents.

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What is the significance of a Punnett Square in genetics?

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

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What does it mean if an organism is homozygous?

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An organism is homozygous if it has two identical alleles for a particular gene (e.g., AA or aa).