Monohybrids Practice

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-LS3-2

NGSS.HS-LS3-3

In fruit flies, normal wings (N) are dominant to short, vestigial wings (n). If two heterozygous normal fruit flies mates and produce 400 offspring, how many are expected to have short wings?

• 400

• 300

• 200

• 100

• 0

Tags

NGSS.HS-LS3-1

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 long tongues?

• 100%

• 75%

• 50%

• 25%

• 0%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Different forms of a gene are called _________.

In guinea pigs, short hair (H) is dominant to long hair. If a short-haired guinea pig and a long-haired guinea pig have 220 offspring and 105 have long hair, what are the parental genotypes?

• HH x Hh

• hh x hh

• Hh x Hh

• HH x hh

• Hh x hh

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

In a species of songbird, long tails (T) are dominant to short tails. A long-tailed bird who had one parent with a short tail mates with a short-tailed songbird. What is the parental genotype of the long-tailed songbird?

• TT

• tt

• Tt

• T

Tags

NGSS.HS-LS3-1

In sheep, black fur (B) is dominant to white fur. Two sheep heterozygous for black fur mate. What is the expected genotypic ratio of their offspring?

• 3:1

• 1:1

• 1:2:1

• 4:0

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

In pea plants, tall height (T) is dominant to short height. If a short plant is crossed with a heterozygous tall plant, what percentage of their offspring is expected to be short? ___%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3