3/17 Flashcard Non-Mendelian Inheritance

Front

What is non-Mendelian inheritance?

Back

Non-Mendelian inheritance refers to patterns of inheritance that do not follow Mendel's laws of segregation and independent assortment. It includes phenomena such as incomplete dominance, codominance, and sex-linked traits.

Front

Define sex-linked traits.

Back

Sex-linked traits are characteristics that are determined by genes located on the sex chromosomes, typically the X chromosome. These traits often show different patterns of inheritance in males and females.

Front

What is the genotype for a female fruit fly with red eyes?

Back

The genotype is X^R X^r, where X^R represents the dominant red eye allele and X^r represents the recessive white eye allele.

Front

What is incomplete dominance?

Back

Incomplete dominance is a type of non-Mendelian inheritance where the phenotype of heterozygotes is intermediate between the phenotypes of the two homozygotes.

Front

Provide an example of codominance.

Back

An example of codominance is the AB blood type in humans, where both A and B alleles are expressed equally.

Front

What is the genotype for a male showing a recessive sex-linked trait?

Back

The genotype is X^a Y, where X^a represents the recessive allele for the trait.

Front

How does a color blind man inherit the trait?

Back

A color blind man inherits the trait from his mother, who must carry at least one color blind allele on one of her X chromosomes.

Front

What is the probability of a color blind child if the father is color blind and the mother is a carrier?

Back

There is a 50% chance of having a color blind child.

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

What are multiple alleles?

Back

Multiple alleles refer to the presence of more than two alleles for a genetic trait within a population, such as the ABO blood group system.