In sweet peas, dominant alleles C and P are necessary for colored flowers. In the absence of either (__ pp or cc __) or
both (cc pp), the flowers are white. What will be the color of the offspring of the crosses listed below and in what
proportions?
(a) Cc Pp x cc pp
(b) Cc Pp x Cc Pp
(c) Cc PP x Cc pp
(d) Cc pp x cc Pp What will be an ideal response?
ANSWER: (a) 1/4 color, 3/4 white
(b) 9/16 color, 7/16 white
(c) 3/4 color, 1/4 white
(d) 1/4 color, 3/4 white
You might also like to view...
Extracts of the rosy periwinkle, Catharanthus roseus, have provided medicine with vincristine and vinblastine, drugs now available for treating cancer
What human action promotes the ability to find this species of plant and discover its potential use for medicines? A) genetic engineering B) overexploitation C) preserving biodiversity D) supporting pharmaceutical industries
DNA:a
is composed of nucleotide building blocks. b. contains uracil instead of thymine. c. is single-stranded. d. contains pyrimidines and purines in a 2:1 ratio. e. contains the sugar ribose.
Consider the model for the equilibrium number of species in a mainland (continental) region, as illustrated in Figure 20.23. What does this model say about the rate of speciation?
A) The rate of speciation decreases as a linear function of the number of species. B) The rate of speciation increases as a linear function of the number of species. C) The rate of speciation increases as a function of the number of species, but the rate of increase decelerates as the number of species becomes large.
Two species of squirrels live on either side of the Grand Canyon. It is believed that a long time ago, before being separated by the canyon, they were the same species. This is an example of
A) mechanical isolation. B) temporal isolation. C) hybrid inviability. D) behavioral isolation. E) allopatric speciation.