Monohybrid Cross Practice

Front

What is an allele?

Back

An allele is one of the two or more forms of a gene that arise by mutation and are found at the same place on a chromosome.

Front

What does it mean for a genotype to be heterozygous?

Back

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

Front

What is a Punnett square used for?

Back

A Punnett square is a diagram used to predict the genotypes of a particular cross or breeding experiment.

Front

What is the phenotypic ratio in a monohybrid cross?

Back

The phenotypic ratio in a typical monohybrid cross is 3:1, representing the dominant to recessive phenotype.

Front

If green is dominant over purple, what does the genotype 'gg' represent?

Back

The genotype 'gg' represents a homozygous recessive individual, which will express the purple phenotype.

Front

What are genotypes?

Back

Genotypes are the genetic constitution of an individual, represented by the alleles they possess, such as Aa, DD, Bb, or yy.

Front

What is the difference between dominant and recessive alleles?

Back

A dominant allele is expressed in the phenotype even when only one copy is present, while a recessive allele is only expressed when two copies are present.

Front

What is a homozygous genotype?

Back

A homozygous genotype consists of two identical alleles for a particular gene, such as AA or aa.

Front

How can you determine the genotype of an individual with a dominant phenotype?

Back

To determine the genotype of an individual with a dominant phenotype, a test cross can be performed with a homozygous recessive individual.

Front

What is the significance of a 1:2:1 genotypic ratio?

Back

A 1:2:1 genotypic ratio typically occurs in the offspring of a monohybrid cross between two heterozygous parents.