10 Jun In fruit flies, the gene for red eyes (R) is dominant
Question
1:In fruit flies, the gene for red eyes (R) is dominant and the gene for sepia eyes (r) is recessive. If a red-eyed homozygous fly (RR) and a red-eyed heterozygous fly (Rr) mate together, what are the possible genotypes of their offspring? (Hint: You many want to complete a Punnett square.)
A:RR and rr
B:Rr only
C: Rr and RR
D:RR, Rr, and rr
2:Which of the following genotypes is homozygous dominant?
A:tt
B:Ff
C:XY
D:SS
3: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 an intermediate (Tt) plant with a tall (TT) plant? (Hint: You may want to complete a Punnett square)
A: 50 percent tall, 25 percent intermediate, 25 percent short
B: 25 percent tall, 50 percent intermediate, 25 percent short
C: 50 percent tall, 50 percent intermediate
D:100 percent intermediate
4: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
5:If a pea 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:SS, Tt, ST
B:ST, St, st
C:SS, Tt, ST, St
D:ST, St
6: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.
B:It 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.
7: 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.
8: In pea plants, purple flowers (P) are dominant over white flowers (p) and tall stems (T) are dominant over short stems (t). Complete a dihybrid cross for parents with the genotypes: PpTT × ppTt 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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