24/25 7th grade week 14 Genetics and Punnett Squares

Front

What is a genotype?

Back

A genotype is the genetic makeup of an organism, represented by the letters that denote the alleles (e.g., GG, Gg, gg).

Front

What does homozygous mean?

Back

Homozygous refers to having two identical alleles for a particular gene (e.g., GG or gg).

Front

What does heterozygous mean?

Back

Heterozygous refers to having two different alleles for a particular gene (e.g., Gg).

Front

What is a Punnett Square?

Back

A Punnett Square is a diagram used to predict the outcome of a genetic cross by showing the possible combinations of alleles from the parents.

Front

If brown eyes (B) are dominant over blue eyes (b), what is the genotype for a person with blue eyes?

Back

The genotype for a person with blue eyes is bb.

Front

What is the probability of getting a homozygous dominant offspring from a cross between two heterozygous parents (Tt x Tt)?

Back

The probability is 25%.

Front

What is the phenotypic ratio of a monohybrid cross?

Back

The phenotypic ratio of a monohybrid cross is typically 3:1 for dominant to recessive traits.

Front

What does it mean if a trait is dominant?

Back

A dominant trait is one that will express itself in the phenotype even if only one allele is present.

Front

What does it mean if a trait is recessive?

Back

A recessive trait is one that will only express itself in the phenotype if two copies of the allele are present.

Front

In a cross between a homozygous dominant (TT) and a homozygous recessive (tt) plant, what will the genotype of the offspring be?

Back

All offspring will be heterozygous (Tt).