EBK CAMPBELL BIOLOGY IN FOCUS
2nd Edition
ISBN: 8220101459299
Author: Reece
Publisher: PEARSON
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Chapter 11.2, Problem 3CC
Summary Introduction
To determine:
The fraction of off springs with a genotype consisting of at least two alleles in homozygous recessive state from the cross between PpYyIi and ppYyii.
Concept introduction:
A cross in which alleles for three characters are used is called a trihybrid cross. In a trihybrid cross, all the three laws of inheritance given by Mendel are followed which are: law of dominance, law of segregation and law of independent assortment.
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Topic: Trihybrid Cross,
Height in merigonias is determined by three unlinked genes that act additively. Each has two alleles, one compltely dominant allele(A,B or C) that makes plants taller and one recessive allele that makes plants shorter. Do the corss AaBbCc X AaBbCc. The fraction of The F1 progenty will be ? Pls explain it with more details. thanks
Crossover frequencies for some genes on a tomato
plant:
• Normal leaves (M) and tall plant (D) 12%
• Normal leaves (M) and normal tomato (O) 33%
• Normal leaves (M) and simple florescence (S) 64%
• Tall plant (D) and normal tomato (0) 21%
• Tall plant (D) and simple fluorescence (S) 52%
Draw a chromosome map and state the cross-over
frequency between genes for a normal tomato and
simple florescence.
EXAMPLE PROBLEM A plant with orange, spotted flowers was grown in the greenhouse from a seed collected in the wild. The plant was self-pollinated and gave rise to the following progeny: 88 orange with spots, 34 yellow with spots, 32 orange with no spots, and 8 yellow with no spots. What can you conclude about the dominance relationships of the alleles responsible for the spotted and unspotted phenotypes? What can you conclude about the genotype of the original plant that had orange, spotted flowers?
Chapter 11 Solutions
EBK CAMPBELL BIOLOGY IN FOCUS
Ch. 11.1 - DRAW IT Pea plants heterozygous for flower...Ch. 11.1 - List all gametes that could be made by a pea plant...Ch. 11.1 - Prob. 3CCCh. 11.2 - For any gene with a dominant allele A and...Ch. 11.2 - Two organisms, with genotypes BbDD and BBDd, are...Ch. 11.2 - Prob. 3CCCh. 11.3 - Incomplete dominance and epistasis are both terms...Ch. 11.3 - Prob. 2CCCh. 11.3 - WHAT IF? A rooster with gray feathers and a hen of...Ch. 11.4 - Beth and Tom each have a sibling with cystic...
Ch. 11.4 - MAKE CONNECTIONS In Table 11.1, note the...Ch. 11 - DRAW IT Two pea plants heterozygous for the...Ch. 11 - A man with type A blood marries a woman with type...Ch. 11 - A man has six fingers on each hand and six toes on...Ch. 11 - Prob. 4TYUCh. 11 - Flower position, stem length, and seed shape are...Ch. 11 - Prob. 6TYUCh. 11 - Prob. 7TYUCh. 11 - Prob. 8TYUCh. 11 - Prob. 9TYUCh. 11 - Prob. 10TYUCh. 11 - In tigers, a recessive allele that is pleiotropic...Ch. 11 - Prob. 12TYUCh. 11 - Imagine that you are a genetic counselor, and a...Ch. 11 - Prob. 15TYUCh. 11 - Prob. 16TYUCh. 11 - Prob. 17TYU
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- Dihybrid Cross In garden pea plants, tall plant height (T) is dominant to dwarf plant height (t) and the trait for axial flower position (F) is dominant to terminal flower position (f). If two plants, both with the genotype. TtFf are crossed, what is the phenotypic ratio for the offspring?arrow_forwardCharacter Seed Shape Round (R) Wrinkled (r) Seed Color Yellow (Y) Green (y) Pod Shape Inflated (I) Constricted (i) If a plant that is heterozygous for all theses characters is crossed with a plant homozygous dominant for seed shape and seed color and heterozygous for pod shape, what proportion of the offspring would you expect to be as follows: 1. Homozygous dominant for the three characters. (Answer in fraction) ____ 2. Recessive for the three characters. (Answer in fraction) _________ 3. Heterozygous dominant for the three characters. Answer in fraction) _______arrow_forward. In nature, the plant Plectritis congesta is dimorphic forfruit shape; that is, individual plants bear either winglessor winged fruits, as shown in the illustration.Wingless fruit Winged fruitPlants were collected from nature before floweringand were crossed or selfed with the following results:Number of progenyPollination Winged WinglessWinged (selfed) 91 1*Winged (selfed) 90 30Wingless (selfed) 4* 80Winged × wingless 161 0Winged × wingless 29 31Winged × wingless 46 0Winged × winged 44 0*Phenotype probably has a nongenetic explanation.Interpret these results, and derive the mode ofinheritance of these fruit-shaped phenotypes. Usesymbols. What do you think is the nongeneticexplanation for the phenotypes marked by asterisks inthe table?arrow_forward
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- Make sure to include (genotypic ratios) For part A) make sure to have table or the phenotypic or genotypic ratios 5. In garden peas, green pod (P) is dominant to yellow pod (p) and tall stemmed (T) plants are dominant to short stemmed plants (t). Please give the genotypic and phenotypic ratios from the following crosses. a) Homozygous green pod homozygous tall stemmed plant crossed with a yellow pod (homozygous) short stemmed (homozygous) plant. b) Homozygous green pod homozygous tall stemmed plant crossed with a heterozygous green pod heterozygous tall stemmed plant. c) Heterozygous green pod heterozygous tall stemmed plant crossed with a heterozygous green pod heterozygous tall stemmed plant. d) Heterozygous green pod homozygous tall stemmed plant crossed with a yellow pod (homozygous) homozygous tall stemmed plant. These are dihybrid crosses. 7. In pea plants, flower colour and pollen shape are located on the same chromosome. A plant with purple flowers and…arrow_forwardincomplete dominance What is the phenotype of the plant with RR genotype? What is the color of a plant with R'R' genotype? What is the color of a plant with genotype RR'? A pink-flowered snapdragon was crossed with a white-flowered snapdragon. What is the probability of producing a pink-flowered plant? What cross will produce the most pink-flowered plants?arrow_forwardRead carefully. Round pea seed shape is dominant over a wrinkled pea seed shape. From a monohybrid cross of heterozygous round peas, what is the probability that a pea pod containing four peas will have exactly two wrinkled peas and both are in the middle positions? Take all possibilities into account. 9/256 1/16 27/256 36/256arrow_forward
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