Exceptions to Mendel

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What is Incomplete Dominance?

Back

A type of inheritance where two alleles blend together to form a new phenotype, such as red and white flowers producing pink flowers.

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What is Co-Dominance?

Back

A type of inheritance where both alleles in a heterozygote are fully expressed, resulting in a phenotype that shows both traits, such as a roan cow with both orange and white fur.

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What are Alleles?

Back

Different forms of a gene that determine specific traits, such as the allele for flower color.

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What is a Carrier in genetics?

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An individual who has one copy of a recessive allele and one copy of a dominant allele, such as a female with genotype X^H X^h for hemophilia.

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What is the phenotype ratio of a roan cow and a roan steer mating?

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1: Orange: 2 Orange and White: 1 White.

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What is Mendelian Inheritance?

Back

The inheritance patterns described by Gregor Mendel, which include the principles of segregation and independent assortment.

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What is the expected percentage of pink flowers from a red (RR) and white (WW) flower cross under incomplete dominance?

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100% of the offspring will have pink (RW) flowers.

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What is a Recessive X-linked Disorder?

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A genetic condition that is carried on the X chromosome and requires two copies of the recessive allele for females or one for males to express the trait.

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What does the genotype X^H X^h represent?

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A female who is a carrier for hemophilia, having one normal allele and one allele for the disorder.

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What is the difference between Dominant and Recessive alleles?

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Dominant alleles express their trait even when only one copy is present, while recessive alleles require two copies to express their trait.