Genetics Test 2024

Front

What is the definition of a dominant allele?

Back

A dominant allele is a variant of a gene that expresses its trait even when only one copy is present in the genotype.

Front

What is the definition of a recessive allele?

Back

A recessive allele is a variant of a gene that only expresses its trait when two copies are present in the genotype.

Front

What is a heterozygous genotype?

Back

A heterozygous genotype consists of two different alleles for a particular gene, such as 'Bb'.

Front

What is a homozygous genotype?

Back

A homozygous genotype consists of two identical alleles for a particular gene, such as 'BB' or 'bb'.

Front

What is codominance in genetics?

Back

Codominance occurs when both alleles in a heterozygous genotype are fully expressed, resulting in a phenotype that shows both traits.

Front

What is the phenotypic ratio expected from a dihybrid cross of two heterozygous parents (BbSs)?

Back

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

Front

What is a Punnett square?

Back

A Punnett square is a diagram used to predict the genetic outcomes of a cross between two organisms.

Front

What does Mendel's law of segregation state?

Back

Mendel's law of segregation states that during the formation of gametes, the two alleles for a trait separate from each other.

Front

What does Mendel's law of independent assortment state?

Back

Mendel's law of independent assortment states that alleles for different traits are distributed to gametes independently of one another.

Front

What is the expected percentage of offspring with normal hearing from a cross between a heterozygous normal hearing dog (Dd) and a deaf dog (dd)?

Back

50% of the offspring are expected to have normal hearing.