Unit 6 Test Retake: The Human Genome - 3rd Period

Front

What is a point mutation?

Back

A point mutation is a change in a single nucleotide in the DNA sequence. It can be a substitution, insertion, or deletion.

Front

Does a point mutation always cause a significant change in phenotype?

Back

FALSE. A point mutation may not always lead to a significant change in phenotype.

Front

What is polygenic inheritance?

Back

Polygenic inheritance refers to traits that are controlled by multiple genes, such as human eye color.

Front

What does a shaded symbol in a pedigree represent?

Back

A shaded symbol in a pedigree represents an individual that expresses a dominant trait.

Front

What is the genotype of an individual expressing an autosomal dominant trait?

Back

The genotype can be either homozygous dominant (AA) or heterozygous (Aa).

Front

What is the most likely genotype for a recessive trait carrier?

Back

The most likely genotype for a recessive trait carrier is heterozygous (Gg).

Front

From whom do males inherit their X chromosome?

Back

Males inherit their X chromosome from their mother.

Front

What is Mendelian inheritance?

Back

Mendelian inheritance refers to the patterns of inheritance that are characteristic of organisms that reproduce sexually, based on Gregor Mendel's laws.

Front

What is codominance?

Back

Codominance is a genetic scenario where both alleles in a heterozygote are fully expressed, resulting in a phenotype that is neither dominant nor recessive.

Front

What is the difference between dominant and recessive traits?

Back

Dominant traits are expressed when at least one dominant allele is present, while recessive traits are expressed only when two recessive alleles are present.