Monohybrid Cross Practice

Front

What is a genotype?

Back

A genotype is the genetic makeup of an organism, represented by the alleles it possesses for a particular gene.

Front

What does heterozygous mean?

Back

Heterozygous refers to having two different alleles for a specific gene, such as Bb.

Front

What does homozygous mean?

Back

Homozygous refers to having two identical alleles for a specific gene, such as AA or aa.

Front

What is the dominant trait in a monohybrid cross?

Back

The dominant trait is the one that is expressed in the phenotype when at least one dominant allele is present.

Front

What is a Punnett square?

Back

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

Front

What is the phenotypic ratio in a monohybrid cross of two heterozygous parents?

Back

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

Front

What is the genotypic ratio in a monohybrid cross of two heterozygous parents?

Back

The genotypic ratio is 1:2:1, representing one homozygous dominant, two heterozygous, and one homozygous recessive.

Front

If long arms (A) are dominant to short arms (a), what is the expected percentage of offspring with short arms from a cross of two heterozygous cacti?

Back

25% of the offspring are expected to have short arms.

Front

What is the difference between dominant and recessive alleles?

Back

Dominant alleles mask the effect of recessive alleles in the phenotype.

Front

What does it mean if an organism is homozygous dominant?

Back

An organism is homozygous dominant if it has two dominant alleles for a trait, such as AA.