Genotype, Phenotype, & Punnett Squares

Front

What is a genotype?

Back

A genotype is the genetic makeup of an organism, represented by the alleles it possesses (e.g., AA, Aa, aa).

Front

What is a phenotype?

Back

A phenotype is the observable physical or biochemical characteristics of an organism, determined by its genotype and environment (e.g., brown fur, white fur).

Front

What does homozygous mean?

Back

Homozygous refers to having two identical alleles for a particular gene (e.g., AA or aa).

Front

What does heterozygous mean?

Back

Heterozygous refers to having two different alleles for a particular gene (e.g., Aa).

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

If two heterozygous parents (Aa) reproduce, what is the probability of having a homozygous genotype?

Back

50%.

Front

If B = brown fur and b = white fur, what is the probability of offspring having white fur from two heterozygous parents (Bb)?

Back

25%.

Front

What are examples of genotypes?

Back

Examples of genotypes include Aa, DD, and yy.

Front

What is the genotype of a homozygous dominant flower with red petals?

Back

RR.

Front

What is the probability of offspring being heterozygous from a cross of two heterozygous parents (Aa x Aa)?

Back

50%.