Ch. 12 Genetics

Front

What is incomplete dominance in genetics?

Back

Incomplete dominance is a genetic situation in which one allele does not completely dominate another allele, resulting in a phenotype that is a blending of the two traits.

Front

What is pleiotropy?

Back

Pleiotropy is a phenomenon where a single gene influences multiple phenotypic traits.

Front

What is the probability of a child inheriting a dominant genetic disorder if one parent is affected and the other is not?

Back

If one parent has a dominant genetic disorder, there is a 50% chance that the child will inherit the disorder.

Front

What is the significance of multiple alleles in genetics?

Back

Multiple alleles refer to the presence of more than two alleles for a genetic trait, allowing for a greater variety of phenotypes.

Front

What are codominant alleles?

Back

Codominant alleles are alleles that are both fully expressed in the phenotype of a heterozygote.

Front

How does geographic isolation contribute to speciation?

Back

Geographic isolation can lead to speciation by preventing interbreeding between populations, allowing them to evolve independently.

Front

What is the role of genotype in determining phenotype?

Back

Genotype refers to the genetic makeup of an organism, which determines its potential traits (phenotype) when expressed.

Front

What is the difference between dominant and recessive alleles?

Back

Dominant alleles are expressed in the phenotype even when only one copy is present, while recessive alleles are only expressed when two copies are present.

Front

What is the expected phenotypic ratio in a monohybrid cross?

Back

The expected phenotypic ratio in a monohybrid cross is typically 3:1 for dominant to recessive traits.

Front

What is a Punnett square and how is it used?

Back

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