Genetics: From Genes to Genomes
6th Edition
ISBN: 9781259700903
Author: Leland Hartwell Dr., Michael L. Goldberg Professor Dr., Janice Fischer, Leroy Hood Dr.
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 2, Problem 26P
A pea plant from a pure-breeding strain that is tall, has green pods, and has purple flowers that are terminal is crossed to a plant from a pure-breeding strain that is dwarf, has yellow pods, and has white flowers that are axial. The F1 plants are all tall and have purple axial flowers as well as green pods.
a. | What |
b. | What phenotypes and ratios would you predict in the progeny from crossing an F1 plant to the dwarf parent? |
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shows the results of a cross between a tall pea plant and a short pea plant. a. What phenotypes and proportions will be produced if a tall F1 plant is backcrossed to the short parent? b. What phenotypes and proportions will be produced if a tall F1 plant is backcrossed to the tall parent?
A pea plant from a pure-breeding strain that is tall, has green pods, and has purple flowers that are terminal is crossed to a plant from a pure-breeding strain that is dwarf, has yellow pods, and has white flowers that are axial. The F1 plants are all tall and have purple axial flowers as well as green pods.
What phenotypes do you expect to see in the F2?
What phenotypes and ratios would you predict in the progeny from crossing an F1 plant to the dwarf parent?
Leaf color and stem length in a certain species of diploid flowers are controlled
separately by the R and S locus. The R allele (dominant) results in red leaves while r
results in yellow leaves. S (dominant) results in short stems and s results in long stems.
A cross is performed between a true breeding long-stemmed red plant and a true
breeding short- stemmed yellow plant.
a. What is the genotype and phenotype of the resulting F1 plants?
b. The resulting F1 plants are crossed with long-stemmed plants with yellow leaves.
100 offspring are collected from this cross, and the following phenotype counts
are observed.
phenotype
long red
short red
count
43
8
long yellow
short yellow
9
40
What are the corresponding genotypes for each of the four classes of the offspring from
this cross?
c. Using the information above, determine the genotype of the gametes contributed by
"parent A" to each of the resulting offspring. Label the gamete types as parental or
nonparental.
Chapter 2 Solutions
Genetics: From Genes to Genomes
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