Round is the dominant trait for a pea; the recessive allele produces a wrinkled pea. How can you
obtain true-breeding pea plants having round peas with the least amount of work?
a. Cross plants having round peas with plants having wrinkled peas. Select round pea plants
from the progeny because they are now true-breeding.
b. Cross plants having round peas with other plants having round peas. Do this for multiple
generations.
c. Cross plants having round peas with plants having wrinkled peas. Select round pea plants
from the progeny and do a test cross to determine which parental plants were homozygous
dominant. Use these homozygous pea plants as your true-breeding plants.
d. Cross plants having round peas with plants having wrinkled peas. This will tell you which
round pea plants are homozygous dominant and are thus true-breeding.
e. It's not possible. You can only get true-breeding plants that have wrinkled peas.
D
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If you crossed flies heterozygous for the Cy allele, what phenotypes would you find in the adult F1 generation?
Let Cy = curly wings and Cy+ = wild type. In Drosophila, the Cy allele behaves as a dominant mutation that produces curly wings in the heterozygous condition (Cy/Cy+), but also behaves as a recessive lethal mutation. Flies homozygous for the Cy allele die before reaching adulthood. A. both wild type and curly wings B. wild type only C. curly wings only D. None because all the F1 flies would die before reaching adulthood. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain? Gather Content · What do you already know about dominant and recessive alleles? Consider Possibilities · What other information is related to the question? Which information is most useful? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
What was the dependent variable in the peacock butterfly experiments?
a. changing predators b. changing habitats c. painting the wings d. clipping the hindwings e. getting eaten
Habitat changes for cichlids living in Lake Victoria are causing a change in:
a. mate choice. b. species diversity. c. coloration of male cichlids. d. frequency of hybrids. e. All of these
Cytoplasm has a pH of about 7. What is the concentration, in moles/ liter of the hydrogen ion?
A) 7 x 10^-1 B) 7 C) 7 x 10^-7 D) 1 x 10^7 E) 1 x 10^-7