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How can the product rule be used to predict the results of crosses in which multiple genes are studied simultaneously?

Human Biology (MindTap Course List)

11th Edition

ISBN:9781305112100

Author:Cecie Starr, Beverly McMillan

Publisher:Cecie Starr, Beverly McMillan

Chapter19: Introduction To Genetics

Section: Chapter Questions

Problem 3RQ: What is probability, and how is it applied in genetic analysis?

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Concept explainers

Genome annotation

The technique of linking biological information to genome sequences is termed genome annotation. Gene annotation is the method of identifying gene locations and coding sections. It helps us understand what these genes are doing in the body through establishing structural characteristics and linking them to the actions of various proteins.

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Individuals of genotype AaBb were mated to individuals of genotype aabb. One thousand offspring were counted, with the following results: 474 Aabb, 480 aaBb, 20 AaBb, and 26 aabb. What type of cross is it? Are these loci linked? What are the two parental classes and the two recombinant classes of offspring? What is the percentage of recombination between these two loci? How many map units apart are they?
In tomatoes, a heterozygous plant with normal fruit and purple stems is crossed with a recessive plant having fasciated fruit and green stems (test cross). The following distribution of offspring is observed: normal fruit, purple stems 38.5% fasciated fruit, green stems 38.5% normal fruit, green stems 11.5% fasciated fruit, purple stems 11.5% What is the recombination frequency?
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What are the expected phenotypic ratios in the offspring of the following crosses (written as red : orange : green)? Use the most simplified ratio (e.g. 1 : 4 instead of 2 : 8). Fill in 0 if none of the offspring from a cross will be a particular color. RRgg x rrGg - red : orange : green RrGg x RrGg - red : orange : green RrGg x rrGg - red : orange : green
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If 2 spot (S) is dominant to 4 spot (s), give the genotypes for the parents in the following crosses: 2 spot × 2 spot yields 2 spot and 4 spot 2 spot × 4 spot yields only 2 spot 2 spot × 4 spot yields 2 spot and 4 spot 2 spot × 2 spot yields only 2 spot 4 spot × 4 spot yields only 4 spot
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Individuals of genotype AaBb were mated to individuals of genotype aabb. One thousand offspring were counted, with the following results: 474 Aabb, 480 aaBb, 20 AaBb, and 26 aabb. What type of cross is it? Are these locilinked? What are the two parental classes and the two recombinant classes of offspring? What is the percentage of recombination between these two loci? How many map units apart are they?
In a particular organism, the A locus and the D locus are so tightly linked that no crossing over is ever observed between them. If an AADD individual is crossed to an aadd individual, what types of gametes will their double-heterozygote F1 offspring produce and in what proportions? Group of answer choices 25% parental and 75% recombinant gametes 75% parental and 25% recombinant gametes 100% parental and 0% recombinant gametes 50% parental and 50% recombinant gametes 0% parental and 100% recombinant gametes
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