Punnett Squares & Probability

Front

What does a Punnett square represent?

Back

A Punnett square represents the possible genetic combinations of offspring from two parents, illustrating the probabilities of different traits being expressed.

Front

What is the definition of genotype?

Back

Genotype refers to the genetic makeup of an organism, specifically the alleles it possesses for a particular trait.

Front

What is the definition of phenotype?

Back

Phenotype is the physical appearance or observable characteristics of an organism, resulting from the interaction of its genotype with the environment.

Front

What does homozygous mean?

Back

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

Front

What does heterozygous mean?

Back

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

Front

What is incomplete dominance?

Back

Incomplete dominance is a genetic situation where one allele does not completely dominate another, resulting in a phenotype that is a blend of both traits.

Front

What is codominance?

Back

Codominance is a genetic situation where both alleles in a heterozygote are fully expressed, resulting in offspring with a phenotype that shows both traits distinctly.

Front

What is the probability of an offspring having a recessive trait if both parents are heterozygous?

Back

The probability is 25%.

Front

If one brother has genotype BB and the other has Bb, what can be said about their phenotypes?

Back

They have the same phenotype (brown eyes) but different genotypes.

Front

What is the chance of an offspring having a dominant trait if one parent is homozygous dominant and the other is homozygous recessive?

Back

The chance is 100%.