Genetics Test

Front

What does homozygous mean in genetics?

Back

Homozygous refers to having two identical alleles for a particular gene, such as GG or gg.

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 only expressed when two recessive alleles are present.

Front

What is the genotype of an individual with brown eyes if blue is recessive?

Back

The genotype could be either homozygous dominant (BB) or heterozygous (Bb) for brown eyes.

Front

What is a purebred organism?

Back

A purebred organism has identical alleles for a specific trait, meaning it is homozygous.

Front

What is a beneficial mutation?

Back

A beneficial mutation is a genetic change that enhances an organism's fitness or survival in its environment.

Front

What is the phenotype of an organism?

Back

The phenotype is the observable physical or biochemical characteristics of an organism, determined by its genotype.

Front

What does it mean if a trait is recessive?

Back

A recessive trait is one that is masked by a dominant trait and only expressed when two recessive alleles are present.

Front

What is the significance of blood type inheritance?

Back

Blood type inheritance demonstrates how multiple alleles can interact, with A and B being co-dominant and O being recessive.

Front

What is the genotype of an individual with blood type O?

Back

The genotype for blood type O is homozygous recessive (ii).

Front

What is the result of crossing two heterozygous individuals for a trait?

Back

The result is a phenotypic ratio of 3:1 for dominant to recessive traits.