Monohybrid Practice Questions

If in dogs floppy ears (E) is dominant over non-floppy ears (f), what is the probability of the offspring having floppy ears if a homozygous dominant floppy-eared dog is crossed with a heterozygous floppy-eared dog?

• 0%

• 25%

• 50%

• 75%

• 100%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-3

In Walruses if long tusks (T) is dominant over short tusks (t), what is the probability of the offspring having short tusks in a cross between two heterozygous long-tusked walruses?

• 0%

• 25%

• 50%

• 75%

• 100%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-3

If in horses a long mane (M) is dominant over a short mane (m), what is the probability of the offspring having a short mane in a cross between a heterozygous horse with a long mane and a homozygous recessive horse with a short mane?

• 0%

• 25%

• 50%

• 75%

• 100%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-3

In southern painted turtles having a red stripe on its shell (R) is dominant to not having a red stripe (r). In a cross between a homozygous dominant turtle with a red stripe and a turtle that does not have a red stripe, what is the probability of the offspring having no stripe on their shell?

• 0%

• 25%

• 50%

• 75%

• 100%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-3

Punnett Square #1

In plants tall is dominant to short.

Cross two heterozygous plants.

What is the phenotypic ratio?

• 100% Tall

• 50 % Tall 50% short

• 75 Tall 25% Short

Tags

NGSS.HS-LS3-3

Round seeds (R) are dominant over wrinkled seeds (r). What percentage of the offspring will be round from the following cross?
RR X Rr

• 100%
• 75%
• 50%
• 25%

Tags

NGSS.HS-LS3-3

Round seeds (R) are dominant over wrinkled seeds (r). What percentage of the offspring will be round from the following cross?
Rr X Rr

• 100%
• 75%
• 50%
• 25%

Tags

NGSS.HS-LS3-3

A tall pea plant (TT) is crossed with a short pea plant (tt). What percentage of the offspring will be tall?

• 100%
• 75%
• 50%
• 25%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-3

A heterozygous round seeded plant (Rr) is crossed with a homozygous dominant round seeded plant (RR). What percentage of the offspring will be homozygous dominant?

• 100%
• 75%
• 50%
• 25%

Tags

NGSS.HS-LS3-3

Tomato plants usually have hairy stems. Hairless stems are present in tomato plants that are homozygous recessive for this trait. If the stem characteristics are determined by a single gene, what are the expected phenotype percentages for the offspring of a heterozygous hairy plant and a hairless plant?

• 100% hairy, 0% hairless
• 75% hairy, 25% hairless
• 50% hairy, 50% hairless
• 25% hairy, 75% hairless

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-3