Q1 You have a population of fruitflies that is in Hardy-Weinberg equilibrium. 25% of the population have black bodies (recessive), while 75% are wildtype (dominant). What is the frequency of the wildtype allele (p)?
B. You can’t tell because the frequency of heterozygotes is not given
Q2 A population of lupines, has two colors: purple, which is dominant, and white, which is recessive.The frequency of the dominant allele is 0.3. If there are 100 plants in this population, approximately how many of them should be homozygous recessive for flower color?
Q3 You cross homozygous female wild-type fruitflies with males that have curly bristles.The F1 offspring are 1/2 female with normal bristles and 1/2 male with curly bristles.When you cross the F1 x F1 generation, you get the same result.Which of the following is the explanation for the curly bristle phenotype that is most consistent with these data?
A. The gene for this trait is located on the X chromosome
B. The gene for this trait is located on the X chromosome, but is suppressed in females.
C. The gene for this trait is located on the Y chromosome
D. The gene for this trait is located on a different chromosome than X or Y, and is showing normal inheritance.
Q4 You backcross a heterozygous tomato plant that has round fruit and cut leaf margins to a homozygous recessive with oblong fruit and smooth leaf margins.Of 160 offspring, how many do you expect to have oblong fruit and smooth leaf margins?
A. 10 plants
B. 90 plants
C. 40 plants
D. 30 plants