In Drosophila melanogaster, the gene for eye color is located on the X chromosome. The allele for red eye color
(Xw+) is dominant over the allele for white eye color (Xw). You examine a vial of 100 flies that are all offspring from a
single genetic cross. You see only red-eyed females and white-eyed males present. The genotypes of the parents were
____.
a. Xw+Xw+; XwY
b. Xw+Xw; XwY
c. XwXw; Xw+Y
d. Xw+Xw; Xw+Y
e. XwXw; XwY
ANSWER: c
You might also like to view...
What benefits do plant-eating animals receive from the bacteria that live in their guts?
What will be an ideal response?
Which part of the amphibian life cycle prevents them from being fully terrestrial?
a. finding a mate b. reproduction c. respiration d. obtaining food e. locomotion
In both progeria and Werner syndrome, cells are switched from a growth to a maintenance mode, halting
____________________. Fill in the blank(s) with the appropriate word(s).
Export of RNAs from the nucleus occurs primarily by
a. passive diffusion through nuclear pore complexes. b. cotranscriptional insertion through nuclear envelope membrane protein pores. c. selective transport through nuclear pore complexes in association with proteins. d. release from the nucleus when it breaks down at mitosis.