Genetics Review

Front

What is a genotype?

Back

The genotype is the genetic makeup of an individual, represented by the alleles inherited from their parents.

Front

What is codominance in genetics?

Back

Codominance is a type of inheritance where both alleles in a heterozygous individual are fully expressed, resulting in offspring with a phenotype that is neither dominant nor recessive.

Front

What is the difference between homozygous and heterozygous genotypes?

Back

Homozygous genotypes have two identical alleles for a trait (e.g., HH or hh), while heterozygous genotypes have two different alleles (e.g., Hh).

Front

What is an autosomal recessive disorder?

Back

An autosomal recessive disorder is a genetic condition that occurs when an individual inherits two recessive alleles for a trait, one from each parent.

Front

What is the probability of two heterozygous parents having a child with an autosomal recessive disorder?

Back

There is a 25% probability that two heterozygous parents (Hh) will have a child with the disorder (hh).

Front

What does it mean for a trait to be X-linked?

Back

X-linked traits are associated with genes located on the X chromosome, often affecting males more severely due to their single X chromosome.

Front

What is incomplete dominance?

Back

Incomplete dominance is a form of inheritance where the phenotype of a heterozygote is intermediate between the phenotypes of the two homozygotes.

Front

What is the significance of a pedigree chart in genetics?

Back

A pedigree chart is a diagram that shows the occurrence and appearance of phenotypes of a particular gene or organism and is used to track genetic traits through generations.

Front

What is the role of alleles in genetics?

Back

Alleles are different versions of a gene that determine specific traits, and individuals inherit one allele from each parent.

Front

What is the expected blood type of a child from a type O blood parent and a type AB blood parent?

Back

The expected blood types of the child could be A or B, but not AB or O.