Concepts of Genetics (11th Edition)
11th Edition
ISBN: 9780321948915
Author: William S. Klug, Michael R. Cummings, Charlotte A. Spencer, Michael A. Palladino
Publisher: PEARSON
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Chapter 4, Problem 42ESP
In four o’clock plants, many flower colors are observed. In a cross involving two true-breeding strains, one crimson and the other white, all of the F1 generation were rose color. In the F2, four new
Propose an explanation for the inheritance of these flower colors.
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The crossing of two orange-flowering plants results in ~2/3 orange-flower progeny and ~1/3 white-flower progeny. The crossing of two orange-flowering F1 plants generates the same progeny ratios as observed for the parental cross, while the crossing of white-flowering F1 plants only produces white-flowering progeny. What is a likely explanation for these results?
In four o’clock plants, many flower colors are observed. In a crossinvolving two true-breeding strains, one crimson and the otherwhite, all of the F1 generation were rose color. In the F2, four newphenotypes appeared along with the P1 and F1 parental colors.The following ratio was obtained:
1/16 crimson2/16 orange1/16 yellow2/16 magenta4/16 rose2/16 pale yellow4/16 white
Propose an explanation for the inheritance of these flowercolors.
In roses, purple flower color is determined by the dominant P allele, while pp
homozygotes are white. The presence of long stems is determined by the
dominant S allele, while ss homozygotes have short stems. Both mutations are
completely penetrant. A test cross was performed between a rose plant of
unknown genotype with a white flowered, short stemmed rose plant (pp ss) and
the following 200 progeny plants were obtained:
84 white flowers, long stems
16 purple flowers, long stems
82 purple flowers, short stems
18 white flowers, short stems
Select the statements below that are TRUE.
Select 2 correct answer(s)
The P and S genes independently assort during meiosis.
The map distance between P and S is 17 CM.
The genotype of the progeny plants with purple flowers and short stems is
PP ss.
The map distance between P and S is 83 CM.
The homologs in the plant with unknown genotype are p S and Ps.
The homologs in the plant with unknown genotype are PS and p s.
Chapter 4 Solutions
Concepts of Genetics (11th Edition)
Ch. 4 - In the guinea pig, one locus involved in the...Ch. 4 - In some plants a red flower pigment, cyanidin, is...Ch. 4 - Below are three pedigrees. For each trait,...Ch. 4 - Prob. 1CSCh. 4 - Prob. 2CSCh. 4 - Prob. 3CSCh. 4 - HOW DO WE KNOW? In this chapter, we focused on...Ch. 4 - CONCEPT QUESTION Review the Chapter Concepts list...Ch. 4 - In shorthorn cattle, coat color may be red, white,...Ch. 4 - In foxes, two alleles of a single gene, P and p,...
Ch. 4 - In mice, a short-tailed mutant was discovered....Ch. 4 - List all possible genotypes for the A, B, AB, and...Ch. 4 - With regard to the ABO blood types in humans,...Ch. 4 - In a disputed parentage case, the child is blood...Ch. 4 - The A and B antigens in humans may be found in...Ch. 4 - In chickens, a condition referred to as creeper...Ch. 4 - In rabbits, a series of multiple alleles controls...Ch. 4 - Three gene pairs located on separate autosomes...Ch. 4 - As in Problem 12, flower color may be red, white,...Ch. 4 - Horses can be cremello (a light cream color),...Ch. 4 - With reference to the eye color phenotypes...Ch. 4 - Pigment in mouse fur is only produced when the C...Ch. 4 - In rats, the following genotypes of two...Ch. 4 - Given the inheritance pattern of coat color in...Ch. 4 - In a species of the cat family, eye color can be...Ch. 4 - In a plant, a tall variety was crossed with a...Ch. 4 - In a unique species of plants, flowers may be...Ch. 4 - Five human matings (15), identified by both...Ch. 4 - A husband and wife have normal vision, although...Ch. 4 - In humans, the ABO blood type is under the control...Ch. 4 - In Drosophila, an X-linked recessive mutation,...Ch. 4 - Another recessive mutation in Drosophila, ebony...Ch. 4 - In Drosophila, the X-linked recessive mutation...Ch. 4 - While vermilion is X-linked in Drosophila and...Ch. 4 - In a cross in Drosophila involving the X-linked...Ch. 4 - Consider the three pedigrees below, all involving...Ch. 4 - In goats, the development of the beard is due to a...Ch. 4 - Predict the F1 and F2 results of crossing a male...Ch. 4 - Two mothers give birth to sons at the same time at...Ch. 4 - Discuss the topic of phenotypic expression and the...Ch. 4 - Prob. 35PDQCh. 4 - Labrador retrievers may be black, brown...Ch. 4 - A true-breeding purple-leafed plant isolated from...Ch. 4 - In Dexter and Kerry cattle, animals may be polled...Ch. 4 - A geneticist from an alien planet that prohibits...Ch. 4 - The following pedigree is characteristic of an...Ch. 4 - Students taking a genetics exam were expected to...Ch. 4 - In four oclock plants, many flower colors are...Ch. 4 - Proto-oncogenes stimulate cells to progress...Ch. 4 - Below is a partial pedigree of hemophilia in the...
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