Unit 3 Review

Front

What is the probability of obtaining a heterozygous offspring from a cross between two heterozygous parents?

Back

50%

Front

What is a genotype?

Back

The genes within DNA that are responsible for a trait in an organism.

Front

In a genetic cross between two heterozygous individuals, what is the probability of obtaining a homozygous recessive offspring?

Back

25%.

Front

In a certain species of plant, the allele for tall stems (T) is dominant over the allele for short stems (t). If a heterozygous tall plant is crossed with a short plant, what is the probability that the offspring will be short?

Back

50%.

Front

What does homozygous mean?

Back

Having two identical alleles for a particular gene.

Front

What does heterozygous mean?

Back

Having two different alleles for a particular gene.

Front

What is a Punnett square?

Back

A diagram used to predict the outcome of a genetic cross.

Front

What is the difference between dominant and recessive alleles?

Back

Dominant alleles express their trait even if only one copy is present; recessive alleles require two copies to express their trait.

Front

If a plant has the genotype Tt, what is its phenotype?

Back

Tall, because T (tall) is dominant.

Front

What is the expected phenotypic ratio of a monohybrid cross between two heterozygous parents?

Back

3:1.