Genetics & Punnett Squares

Stuart Snail is heterozygous for tall eyeballs.  Sally Snail has tall eyeballs but does carry the recessive allele.  What are the chances that their baby snail would have short eyeballs?

• 75%
• 50%
• 25%
• 0%

In some carnations, flower color exhibits codominance. When crosses, Red (R) and white (W) flowers make speckled flowers (RW) that show both colors.
Complete a cross between A speckled flower and a red flower. Find the phenotype ratio.

• 2 red: 2 speckled: 0 white
• 4 red: 0 speckled: 0 white
• 0 red: 4 speckled: 0 white
• 0 red: 2 speckled: 2 white

If brown eyes are dominant over blue eyes, what would be the  parent genotypes if two heterozygous brown eyed persons were crossed?

• BB and bb
• BB and Bb
• Bb and Bb
• bb and Bb

This is an example of ___________?

• Incomplete dominance
• Co-Dominance

When one allele is not dominant over another, resulting in a blended phenotype for heterozygous offspring is considered....

• Incomplete Dominance

• Codominance

Some flowers are controlled by codominance. Red flowers (RR), blue flowers (BB) and Speckled flowers (RB).

Cross a red flower with a speckled flower. What is the phenotypic ratio?

• 2 red, 2 speckled

• 2 red, 2 blue

• 2 blue, 2 speckled

George Guinea Pig met Greta Guinea Pig at a party.  George is heterozygous for his long hair, but Greta has short hair.  How can we describe Greta's genotype?

• homozygous dominant
• homozygous recessive
• heterozygous

this image is an example of

• codominance
• dominance
• incomplete dominance

In the punnett square shown, what is the genotypes of the two parents?

• RW and RR
• RW and WW
• RR and WW
• RW and RR

This is an example of ___________.

• Incomplete Dominance
• Codominance