Genetics: Punnett Squares

Front

What is a homozygous allele pair?

Back

A homozygous allele pair consists of two identical alleles for a specific gene, such as BB or aa.

Front

What is a heterozygous allele pair?

Back

A heterozygous allele pair consists of two different alleles for a specific gene, such as Bb or Ff.

Front

What does a Punnett square show?

Back

A Punnett square is a diagram used to predict the genetic outcomes of a cross between two organisms.

Front

What is the probability of an offspring showing a dominant trait if both parents are heterozygous?

Back

75% chance of showing the dominant trait.

Front

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

Back

25% chance of showing the recessive trait.

Front

What does it mean if an allele is dominant?

Back

A dominant allele is one that expresses its trait even when paired with a different allele.

Front

What does it mean if an allele is recessive?

Back

A recessive allele only expresses its trait when paired with another recessive allele.

Front

If one parent is homozygous dominant (BB) and the other is homozygous recessive (bb), what is the probability of offspring being heterozygous?

Back

100% chance of offspring being heterozygous (Bb).

Front

What is the genotype of an organism?

Back

The genotype is the genetic makeup of an organism, represented by the alleles it possesses.

Front

What is the phenotype of an organism?

Back

The phenotype is the observable physical traits of an organism, determined by its genotype.