Unit 4 Genetics Assessment Review

Front

What is codominance in genetics?

Back

Codominance is a type of inheritance where both alleles in a heterozygote are fully expressed, resulting in a phenotype that is neither dominant nor recessive. An example is AB blood type.

Front

What is the role of the environment in determining phenotype?

Back

The environment can influence the expression of genes, leading to variations in phenotype. For example, a snowshoe hare changes color based on the seasons due to environmental factors.

Front

What phenotype is produced by the mRNA code UUU CCU CCC GUG?

Back

The phenotype produced is dry ear wax.

Front

What is incomplete dominance?

Back

Incomplete dominance is a genetic situation in which one allele does not completely dominate another allele, resulting in a new phenotype that is a blend of the two. An example is wavy hair.

Front

What is the expected phenotypic ratio when crossing two heterozygous pea plants (TtPp)?

Back

The expected phenotypic ratio is 9:3:3:1.

Front

Define multiple alleles in genetics.

Back

Multiple alleles refer to the presence of more than two alleles for a genetic trait within a population. An example is the ABO blood group system.

Front

What is polygenic inheritance?

Back

Polygenic inheritance is a type of inheritance where multiple genes influence a single trait, resulting in a continuous range of phenotypes, such as height or skin color.

Front

Explain the concept of a phenotype.

Back

A phenotype is the observable physical or biochemical characteristics of an organism, determined by both genetic makeup and environmental influences.

Front

What is a genotype?

Back

A genotype is the genetic constitution of an individual, specifically the alleles present for a particular gene.

Front

What is the difference between dominant and recessive alleles?

Back

Dominant alleles mask the effect of recessive alleles in a heterozygous genotype, leading to the dominant trait being expressed.