Monohybrid Cross Practice

Brown hair is dominant over light hair. If a homozygous parent (Aa) is crossed with a heterozygous recessive parent (aa), their children will have...

• Only Brown Hair

• Only Light Hair

• Some brown and some light

Tags

NGSS.HS-LS3-1

In guinnea pigs, black eyes are dominant to red eyes. A male guinnea pig that is heterozygous is crossed with a female that is homozygous recessive. What are the expected phenotypes of their offspring?

• Red Eyed and Black Eyed

• Only Red Eyed

• Only Black Eyed

Tags

NGSS.HS-LS3-1

In cacti, long arms (A) are dominant to short arms (a).  Suppose 2 heterozygous cacti are crossed.  What percentage of their offspring are expected to have short arms?

• 0%
• 25%
• 75%
• 100%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-3

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-LS3-3

What are the possible genotypes for this cross?

• TT = 25% Tt= 50% tt=25%
• all tall
• TT= 75% tt = 25%
• Tt = 100%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

If green is dominant over purple, then what is the genotype for this individual?

• Purple
• Green
• GG
• gg

Tags

NGSS.HS-LS3-1

In guinea pigs, the allele for short hair is dominant. If all the guinea pigs are born short haired what are the possible genotypes of the parents? (There are two possible combinations.)

• Ss + Ss

• SS + SS

• SS + Ss

• ss + ss

Tags

NGSS.HS-LS3-2

NGSS.HS-LS3-3

Long tongues (T) are dominant to short tongues in green tree frogs.  What is the probability that two frogs that are heterozygous for long tongues could produce offspring with short tongues?

• 100%
• 75%
• 50%
• 25%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-3

Each one of the boxes on the Punnett Square represents what probability of an offsprings' genotype?

• 25%
• 1%
• 10%
• 0%

Tags

NGSS.HS-LS3-3

In a flowering plant species, red flower color (R) is dominant over white flower color (r). Which of the following genotypes would appear red (MARK ALL THAT APPLY!)

• rr

• None of these

• RR

• Rr

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2