Genetics Punnett Square

Two snapdragon plants are crossed. One plant produces red flowers and the other plant produces white flowers. The cross between these two plants produces snapdragon plants with pink flowers. Which statement explains why the offspring have pink flowers?

• A. The offspring have two copies of the allele that codes for pink.

• B. The offspring have one allele that codes for red and one allele that codes for white.

• C. The flower color is determined by the dominant parent.

• D. The flower color is determined by environmental conditions.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Which of the following allele pairs is homozygous?

• Ee

• BB

• Tt

When writing allele pairs, the dominant allele is written as a 

• capital letter

• lower case letter

• a number

Tags

NGSS.HS-LS3-1

Homozygous is when...

• the alleles are the same

• the alleles are different

• the alleles are absent

• the alleles are present

Tags

NGSS.HS-LS3-1

Recessive alleles are represented by a:

• Male gene

• lowercase letter

• dominant trait

• capital letter

Aa, DD, Ba, and yy are all examples of ---

• genotypes

• phenotypes

An organism’s genetic makeup

• genotype

• phenotype

• homozygous

• heterozygous

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

An organism’s genetic makeup; the pair of alleles for a trait is called a(n)

• dominant trait

• genotype

• phenotype

• recessive trait

Tags

NGSS.HS-LS3-1

In a Punnett square, a lower case letter stands for a ____________ allele.

• dominant

• recessive

• homozygous

• heterozygous

T - tall and t = short
In the punnett square below, what belongs in the missing square

• tt

• Tt

• Bb

• TT

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2