Phenotypes and Genotypes

Tongue rolling is dominant over not being able to roll your tongue. Let's use the letter "T" to represent the alleles. Which letter would represent the dominant allele?

• t

• T

Referring to the phenotype of being able to roll your tongue, what genotype would a person have if he was NOT able to roll his tongue?

• TT

• Tt

• tt

The genotype "tt" is ____.

• heterozygous

• homozygous recessive

• homozygous dominant

The genotype "Tt" is ___.

• heterozygous

• homozygous recessive

• homozygous dominant

Purple flowers on a pea plant is dominant to white flowers. What are the 2 possible genotypes of plants with purple flowers?

• PP and pp

• Pp and pp

• PP and Pp

Is it possible for these 2 purple-flowered parent pea plants to have offspring with white flowers?

PP and pp

• Yes

• No

Tags

NGSS.MS-LS3-2

Two pea plants have purple flowers. Having purple flowers is a dominant trait. The two pea plants are crossed and some of their offspring have white flowers. What MUST the parent genotypes be?

• Both PP

• Both pp

• Both Pp

Tags

NGSS.MS-LS3-2

Being right-handed is a dominant trait. Using the letter R, create the genotype for someone who is homozygous dominant for that trait. The genotype would be ____.

Knowing that right-handedness is dominant to being left-handed, what PHENOTYPE would a person have if they were heterozygous for the trait?

• Left-handed

• rr

• Right-handed

• Rr

Which of the following is a genotype?

• red color

• left-handed

• homozygous dominant

• purple flowers