Practice: Dihybrid Crosses

A male beetle has the genotype Ttbb. If this beetle mates with a female with genotype TTBb, what is the chance their offspring will have the genotype TtBb? [Type the answer in fraction]

Tags

NGSS.HS-LS3-3

Aa, DD, bB, yy are all examples of

• genotypes
• phenotypes

Tags

NGSS.HS-LS3-1

Which of the following genotypes is heterozygous?

• Bb
• BB
• bb
• B

Tags

NGSS.HS-LS3-1

Which of the following genotypes is homozygous dominant?

• A
• Aa
• AA
• aa

Tags

NGSS.HS-LS3-1

An organism’s genetic makeup, or allele combinations

• Recessive
• Genotype
• Phenotype
• Heterozygous

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Cross Two Homozygous plants

(RRYY x rryy)

R = round seeds, r = wrinkled seeds Y = yellow seeds, y = green seeds

What is the probability for an offspring to have Round and Yellow seeds? [Answer in fraction]

Tags

NGSS.HS-LS3-3

A white mouse with red eyes is crossed with a black mouse with brown eyes. The white mouse is recessive for both of its traits. The black mouse is dominant for both of its traits.

This cross would be

• BBEE x bbee

• BBEe x BbEe

• BbEE x BbEe

• BBee x BBEE

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

In certain camels, one hump (H) is dominant over two humps (h) while long necks (N) are dominant over short necks (n). Cross a camel that is heterozygous for both traits with a camel that is homozygous recessive for hump & heterozygous for the neck.

What is the probability for an offspring to be homozygous recessive for both traits? [Answer in fraction]

Tags

NGSS.HS-LS3-3

A male alligator has the genotype RrAa. If this alligator mates with a female with genotype RrAa, what is the chance their offspring will have the genotype rrAa? [Type the answer in fraction]

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-3

Cross Two Homozygous plants

(RrYy x rrYy)

R = round seeds, r = wrinkled seeds Y = yellow seeds, y = green seeds

What is the probability for an offspring to have Wrinkled and Green seeds? [Answer in fraction]

Tags

NGSS.HS-LS3-3