Punnett Square Practice

Front

What is a Punnett Square?

Back

A tool scientists use to determine all the possible genotypes for offspring.

Front

In a heterozygous genotype, the ___________ allele takes over in the phenotype.

Back

dominant

Front

In a certain species of plant, the color purple (P) is dominant to the color white (p). What is the probability of an offspring being purple?

Back

100%.

Front

What is the probability of heterozygous offspring?

Back

50%.

Front

What does the term 'allele' refer to?

Back

Different forms of a gene that can exist at a specific locus.

Front

What is the difference between dominant and recessive alleles?

Back

Dominant alleles express their trait even when only one copy is present, while recessive alleles require two copies to express their trait.

Front

If a plant has the genotype Pp, what are the possible gametes it can produce?

Back

P and p.

Front

What is the genotype of a plant that is homozygous for purple color?

Back

PP.

Front

What is the expected phenotypic ratio of a monohybrid cross between two heterozygous parents (Pp x Pp)?

Back

3:1 (3 purple: 1 white).

Front

What does it mean if an organism is homozygous?

Back

It has two identical alleles for a particular gene.