Practice: Monohybrid Crosses

Front

What is a monohybrid cross?

Back

A monohybrid cross is a genetic cross between two individuals that differ in one trait, focusing on the inheritance of a single characteristic.

Front

Define genotype.

Back

Genotype refers to the genetic makeup of an individual, specifically the alleles they possess for a particular trait.

Front

Define phenotype.

Back

Phenotype is the physical expression or characteristics of a trait in an individual, resulting from the interaction of genotype and environment.

Front

What does it mean if an allele is dominant?

Back

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

Front

What does it mean if an allele is recessive?

Back

A recessive allele is one that only expresses its trait when two copies are present in the genotype.

Front

What is the expected phenotypic ratio of a monohybrid cross between two heterozygous parents (Aa x Aa)?

Back

The expected phenotypic ratio is 3:1, where 3 offspring show the dominant trait and 1 shows the recessive trait.

Front

If a homozygous dominant individual (AA) is crossed with a homozygous recessive individual (aa), what are the genotypes of the offspring?

Back

All offspring will have the genotype Aa.

Front

What is the probability of obtaining a homozygous recessive offspring from a cross between two heterozygous parents (Aa x Aa)?

Back

The probability is 25%.

Front

In a genetic cross, what does the term 'F1 generation' refer to?

Back

The F1 generation refers to the first generation of offspring produced from a cross of two parental (P) individuals.

Front

What is a Punnett square?

Back

A Punnett square is a diagram used to predict the genotypes and phenotypes of offspring from a genetic cross.