Monohybrid Cross Lesson

Front

What is a genotype?

Back

A genotype is the genetic makeup of an organism, represented by the alleles it possesses, such as Gg.

Front

What is the phenotype of offspring when a homozygous tall plant is crossed with a short plant?

Back

100% tall.

Front

What does it mean if an organism is described as hybrid?

Back

An organism with two different alleles for a trait.

Front

What is a recessive allele?

Back

An allele whose trait only shows up when no dominant allele is present.

Front

What is the dominant allele for height in plants if T = tall and t = short?

Back

T is the dominant allele.

Front

What is the purpose of a Punnett square?

Back

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

Front

If T = tall and t = short, what is the genotype of a homozygous tall plant?

Back

TT.

Front

What is the expected phenotype ratio in a monohybrid cross between two heterozygous tall plants (Tt)?

Back

75% tall, 25% short.

Front

What does homozygous mean?

Back

An organism is homozygous if it has two identical alleles for a trait.

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.