genetics, punnett squares, heredity

Front

What is a homozygous allele pair?

Back

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

Front

What is a heterozygous allele pair?

Back

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

Front

What does it mean when an allele is dominant?

Back

A dominant allele is one that expresses its trait even when only one copy is present (e.g., T in Tt).

Front

What does it mean when an allele is recessive?

Back

A recessive allele only expresses its trait when two copies are present (e.g., tt).

Front

What is a Punnett square?

Back

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

Front

How do you calculate the probability of a trait using a Punnett square?

Back

Count the number of times the desired trait appears in the Punnett square and divide by the total number of outcomes.

Front

What is heredity?

Back

Heredity is the passing of traits from parents to offspring.

Front

What is the probability of producing a homozygous recessive offspring from a Tt x Tt cross?

Back

25%.

Front

If B = brown fur and b = white fur, what is the probability of a brown-furred offspring from a Bb x Bb cross?

Back

75%.

Front

What is the genotype of an organism?

Back

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