Heredity

Front

What are alleles?

Back

Alleles are different forms of a gene.

Front

What does heterozygous mean?

Back

Heterozygous refers to having two different alleles for a particular gene, such as Hh.

Front

What is a genotype?

Back

A genotype is the combination of alleles that determines a specific trait.

Front

What is a phenotype?

Back

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

Front

What does homozygous recessive mean?

Back

Homozygous recessive means having two identical recessive alleles for a trait, such as hh.

Front

What does dominant mean in genetics?

Back

Dominant refers to an allele that expresses its trait even in the presence of a recessive allele.

Front

What is the difference between dominant and recessive alleles?

Back

Dominant alleles mask the effect of recessive alleles in a heterozygous genotype.

Front

What is the genotype for a brown-eyed individual if brown (B) is dominant to blue (b)?

Back

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

Front

If an organism has the genotype Bb, what are its possible phenotypes?

Back

The possible phenotypes are brown (due to the dominant B) and blue (if it has the recessive b allele).

Front

What does it mean if an organism is homozygous dominant?

Back

It means the organism has two identical dominant alleles for a trait, such as BB.