EBK CONCEPTS OF GENETICS
12th Edition
ISBN: 9780134818979
Author: Killian
Publisher: YUZU
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Chapter 3, Problem 26ESP
Datura stramonium (the Jimsonweed) expresses flower colors of purple and white and pod textures of smooth and spiny. The results of two crosses in which the parents were not necessarily true breeding are shown below.
- (a) Based on these results, put forward a hypothesis for the inheritance of the purple/white and smooth/spiny traits.
- (b) Assuming that true-breeding strains of all combinations of traits are available, what single cross could you execute and carry to an F2 generation that will prove or disprove your hypothesis? Assuming your hypothesis is correct, what results of this cross will support it?
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J.W. McKay crossed a stock (true-breeding) melon plant that produced tan seeds with a plant
that only produced red seeds and obtained the following results (J.W. McKay. 1936. Journal of
Heredity 27:110-112).
Cross
F1
F2
Tan x red
13 tan
93 tan, 24 red
a) Explain the inheritance of tan seeds and red seeds in this plant.
b) Assign symbols for the alleles in this cross and draw out the Punnett Squares for the initial
cross and the F1 cross.
Two plants with white flowers, each from true-breeding strains, were crossed. All the F1 plants had red flowers. When these F1 plants were intercrossed, they produced an F2 consisting of 177 plants with red flowers and 142 with white flowers.
(a) Propose an explanation for the inheritance of flower color in this plant species.
(b) Propose a biochemical pathway for flower pigmentation and indicate which genes control which steps in this pathway.
In a plant, a tall variety was crossed with a dwarf variety. All F1 plants were tall. When F1 * F1 plants were interbred, 9/16 of the F2 were tall and 7/16 were dwarf. (a) Explain the inheritance of height by indicating the number of gene pairs involved and by designating which genotypes yield tall and which yield dwarf. (Use dashes where appropriate.) (b) What proportion of the F2 plants will be true breeding if selffertilized? List these genotypes.
Chapter 3 Solutions
EBK CONCEPTS OF GENETICS
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