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Ch. 2 - Transmission Genetics
Sanders - Genetic Analysis: An Integrated Approach 3rd Edition
Sanders3rd EditionGenetic Analysis: An Integrated ApproachISBN: 9780135564172Not the one you use?Change textbook
All textbooksSanders 3rd EditionCh. 2 - Transmission GeneticsProblem 8g
Chapter 2, Problem 8g

Determine whether the statements below are true or false. If a statement is false, provide the correct information or revise the statement to make it correct.


The progeny of a trihybrid cross are expected to have one of 27 different genotypes.

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1
Step 1: Understand the concept of a trihybrid cross. A trihybrid cross involves three traits, each controlled by a pair of alleles. For example, AaBbCc x AaBbCc represents a trihybrid cross.
Step 2: Recall the formula for calculating the number of possible genotypes in a cross. The number of genotypes is determined by the formula \(3^n\), where \(n\) is the number of traits being considered. In this case, \(n = 3\).
Step 3: Substitute \(n = 3\) into the formula \(3^n\). This calculation represents the total number of genotypes expected in the progeny of a trihybrid cross.
Step 4: Evaluate whether the statement 'The progeny of a trihybrid cross are expected to have one of 27 different genotypes' aligns with the result of the formula \(3^n\). If \(3^3 = 27\), the statement is true. If not, revise the statement accordingly.
Step 5: If the statement is false, provide the correct information. For example, if the number of genotypes differs, explain the correct calculation and clarify the expected number of genotypes in the progeny of a trihybrid cross.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Trihybrid Cross

A trihybrid cross involves the genetic crossing of organisms that are heterozygous for three different traits. Each trait is typically represented by two alleles, leading to a combination of alleles in the offspring. The expected genotypic ratio can be calculated using the principles of Mendelian genetics, specifically the product rule for independent assortment.
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Trihybrid Cross

Genotype

Genotype refers to the genetic constitution of an organism, specifically the alleles present at a given locus. In a trihybrid cross, each of the three traits can be represented by two alleles, resulting in a variety of combinations. The total number of different genotypes can be determined by calculating the combinations of alleles from each trait.
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Gamete Genotypes

Independent Assortment

The principle of independent assortment states that alleles for different traits segregate independently during gamete formation. This means that the inheritance of one trait does not affect the inheritance of another. In a trihybrid cross, this principle allows for the calculation of the total number of possible genotypes, which is 2^n, where n is the number of traits being considered.
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Gamete Genetics and Independent Assortment
Related Practice
Textbook Question

Determine whether the statements below are true or false. If a statement is false, provide the correct information or revise the statement to make it correct.


The outcome of a trihybrid cross is predicted by the law of segregation.

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Textbook Question

Determine whether the statements below are true or false. If a statement is false, provide the correct information or revise the statement to make it correct.

Reciprocal crosses that produce identical results demonstrate that a strain is pure-breeding.

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Textbook Question

Determine whether the statements below are true or false. If a statement is false, provide the correct information or revise the statement to make it correct.

If a woman is heterozygous for albinism, an autosomal recessive condition that results in the absence of skin pigment, the proportion of her gametes carrying the allele that allows pigment expression is expected to be 75%.

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Textbook Question

Determine whether the statements below are true or false. If a statement is false, provide the correct information or revise the statement to make it correct.

If a dihybrid plant is self-fertilized,

(1) 9/16 of the progeny will have the same phenotype as the F₁ parent.

(2) 1/16 of the progeny will be true-breeding.

(3) 1/2 of the progeny will be heterozygous at one or both loci.

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Textbook Question

In the datura plant, purple flower color is controlled by a dominant allele, P. White flowers are found in plants homozygous for the recessive allele p. Suppose that a purple-flowered datura plant with an unknown genotype is self-fertilized and that its progeny are 28 purple-flowered plants and 10 white-flowered plants.

Use the results of the self-fertilization to determine the genotype of the original purple-flowered plant.

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Textbook Question

In the datura plant, purple flower color is controlled by a dominant allele, P. White flowers are found in plants homozygous for the recessive allele p. Suppose that a purple-flowered datura plant with an unknown genotype is self-fertilized and that its progeny are 28 purple-flowered plants and 10 white-flowered plants.

If one of the purple-flowered progeny plants is selected at random and self-fertilized, what is the probability it will breed true?

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