Punnett Square and Alleles

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

• 25%

• 0%

• 100%

• 50%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS4-3

B = brown fur  b = white fur
In the punnett square, what is the probability for white fur? 

• 0%

• 25%

• 50%

• 75%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

In the Punnett Square below, what belongs in the missing square?

• tt

• Tt

• Bb

• TT

Tags

NGSS.HS-LS3-2

Each one of the boxes on the Punnett square represents what probability of an offspring's genotype?

• 25%

• 1%

• 10%

• 0%

Brown eyes are dominant over blue eyes. What is the probability that the offspring will have brown eyes in this cross?

• 25%

• 50%

• 75%

• 100%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS4-3

Which of the following alleles is homozygous (purebred) recessive?

• Tt

• tt

• TT

• t

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

• recessive

• dominant

• lower case letter

• both 

What does heterozygous mean?

• An organism that has the same alleles(genes) for a trait.

• An organism that has different alleles(genes) for a trait.

• When neither gene is fully dominant; offspring is a mixture of both.

• The different forms of a trait.

Which of the following is homozygous dominant?

• Yy

• Y

• yy

• YY

An allele whose trait only shows up when no dominant allele is present.

• hidden allele

• dominant allele

• recessive allele

• present allele