1:Which of the following genotypes is homozygous recessive?

 A. ss

 B. Bb

C. TT

D.  XY

 

2:The allele for a widow’s peak has complete dominance over the allele for a straight hairline (w). What is the probability of two parents heterozygous for a widow’s peak (Ww) having an offspring with a widow’s peak?

A: 75 percent

 B:50 percent

C: 0 percent

 D:25 percent

 

3:A mouse’s tail gets cut off. If the mouse has babies later, how will this affect the length of the tails of its offspring?

A: It depends on the length of the mate’s tail.

 BIt will not affect the length of the tails of any of the offspring.:

C: It will affect the length of the tails of all the offspring.

D: It will affect the length of the tails of some of the offspring.

 

4: In a monohybrid cross, if the gene for tall (T) plants was incompletely dominant over the gene for short (t) plants, what would be the predicted result of crossing two intermediate (Tt) parent plants? (Hint: You may want to complete a Punnett square.)

 A:25 percent tall, 50 percent intermediate, 25 percent short

B: 50 percent tall, 25 percent intermediate, 25 percent short

 C:100 percent intermediate

 D::25 percent tall, 75 percent intermediate

 

5: In fruit flies, the gene for red eyes (R) is dominant and the gene for sepia eyes (r) is recessive. If a red-eyed heterozygous fly (Rr) mates with a sepia-eyed homozygous fly (rr), what are the possible genotypes of their offspring? (Hint: You many want to complete a Punnett square.)

A: Rr only

B: RR, Rr, and rr

 C:Rr and rr

D: RR and Rr

 

6:If a baby boy inherits a recessive allele from his mother, in which of the following circumstances would he most likely exhibit that recessive trait?

 A:The allele is X-linked.:

 B:His mother’s father also exhibited the trait.

 C:The allele skips a generation.

D: He inherited the dominant trait from his father.

 

7:If a corn plant has a genotype SsTt, what are the possible genetic combinations that could be present in a single grain of pollen produced by the plant?

A: St, sT

B: Ss, Tt, ST, st

C: ST, st

D: ST, sT, St, st

 

8: 

In some bees, thin stripes (S) are dominant over thick stripes (s) and black eyes (B) are dominant over gray eyes (b). Complete a dihybrid cross for parents with the genotypes: SsBB × ssBb and answer the following in complete sentences.

1. Describe how you would set up a Punnett square for this cross.
2. List the likelihood of each possible offspring genotype.
3. List the likelihood of each possible offspring phenotype.

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Status NEW Posted 13 May 2017 03:05 AM My Price 11.00

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