Genetics & 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., BB, Bb, bb).

Tags

NGSS.HS-LS1-1

NGSS.HS-LS3-2

Front

What is a phenotype?

Back

A phenotype is the observable physical or biochemical characteristics of an organism, determined by its genotype (e.g., eye color, height).

Front

What does homozygous mean?

Back

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

Front

What does heterozygous mean?

Back

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

Front

What is a dominant allele?

Back

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

Front

What is a recessive allele?

Back

A recessive allele is an allele that only expresses its trait when two copies are present (e.g., pp).

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 determine the probability of an offspring's phenotype using a Punnett Square?

Back

Count the number of squares showing the desired phenotype and divide by the total number of squares.

Tags

NGSS.HS-LS3-3

Front

What is the probability of an offspring being homozygous recessive if both parents are heterozygous?

Back

25%.

Tags

NGSS.HS-LS3-3

Front

What is the key for tall and short pea plants?

Back

Tall = T, Short = t.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2