Punnett squares

Front

What is a Punnett square?

Back

A Punnett square is a diagram used to predict the genetic makeup of offspring from two parents based on their alleles.

Front

What do the letters in a Punnett square represent?

Back

The letters represent alleles, which are different forms of a gene. Uppercase letters indicate dominant alleles, while lowercase letters indicate recessive alleles.

Front

What is the difference between homozygous and heterozygous?

Back

Homozygous means having two identical alleles for a trait (e.g., RR or rr), while heterozygous means having two different alleles for a trait (e.g., Rr).

Front

What does it mean if an organism is homozygous dominant?

Back

It means the organism has two dominant alleles for a trait (e.g., RR).

Front

What does it mean if an organism is homozygous recessive?

Back

It means the organism has two recessive alleles for a trait (e.g., rr).

Front

What is the probability of obtaining a homozygous recessive offspring from two heterozygous parents?

Back

The probability is 25%.

Front

How do you determine the genotype of an offspring using a Punnett square?

Back

By filling in the Punnett square with the alleles from each parent and analyzing the resulting combinations.

Front

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

Back

The expected phenotypic ratio is 3:1, where 3 represent the dominant phenotype and 1 represents the recessive phenotype.

Front

What is the expected genotypic ratio from a monohybrid cross between two heterozygous parents?

Back

The expected genotypic ratio is 1:2:1, representing homozygous dominant, heterozygous, and homozygous recessive genotypes.

Front

What is an allele?

Back

An allele is a variant form of a gene that can produce different traits.