Table of contents

1. Introduction to Genetics51m
2. Mendel's Laws of Inheritance3h 37m
3. Extensions to Mendelian Inheritance2h 41m
4. Genetic Mapping and Linkage2h 28m
5. Genetics of Bacteria and Viruses1h 21m
6. Chromosomal Variation1h 48m
7. DNA and Chromosome Structure56m
8. DNA Replication1h 10m
9. Mitosis and Meiosis1h 34m
10. Transcription1h 0m
11. Translation58m
12. Gene Regulation in Prokaryotes1h 19m
13. Gene Regulation in Eukaryotes44m
14. Genetic Control of Development44m
15. Genomes and Genomics1h 50m
16. Transposable Elements47m
17. Mutation, Repair, and Recombination1h 6m
18. Molecular Genetic Tools19m
- Genetic Cloning
  9m
- Methods for Analyzing DNA
  9m
19. Cancer Genetics29m
- Overview of Cancer
  21m
- Cancer Mutations
  7m
20. Quantitative Genetics1h 26m
21. Population Genetics50m
- Hardy Weinberg
  19m
- Allelic Frequency Changes
  31m
22. Evolutionary Genetics29m

4. Genetic Mapping and Linkage

Trihybrid Cross

Genetics

4. Genetic Mapping and Linkage

Trihybrid Cross

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1:42 minutes

Problem 8g

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

Verified step by step guidance

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.

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.

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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Related Practice

Multiple Choice

The following table shows data from a cross (ABC x abc) examining three genes (a, b, and c). Calculate the recombination frequency for A and B

The following table shows data from a cross examining three genes (a, b, and c). Calculate the recombination frequency for A and C

The following table shows data from a cross examining three genes (a, b, and c). Determine the order of genes

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

Three gene pairs located on separate autosomes determine flower color and shape as well as plant height. The first pair exhibits incomplete dominance, where the color can be red, pink (the heterozygote), or white. The second pair leads to personate (dominant) or peloric (recessive) flower shape, while the third gene pair produces either the dominant tall trait or the recessive dwarf trait. Homozygous plants that are red, personate, and tall are crossed to those that are white, peloric, and dwarf. Determine the F₁ genotype(s) and phenotype(s). If the F₁ plants are interbred, what proportion of the offspring will exhibit the same phenotype as the F₁ plants?

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Textbook Question

Researchers cross a corn plant that is pure-breeding for the dominant traits colored aleurone (C1), full kernel (Sh), and waxy endosperm (Wx) to a pure-breeding plant with the recessive traits colorless aleurone (c1), shrunken kernel (sh), and starchy (wx). The resulting F₁ plants were crossed to pure-breeding colorless, shrunken, starchy plants. Counting the kernels from about 30 ears of corn yields the following data.

What is the interference value for this data set?

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Textbook Question

Calculate the recombination frequencies between the gene pairs.

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Textbook Question

Flower color may be red, white, or pink, and flower shape may be personate or peloric. For the following crosses, determine the P₁ and F₁ genotypes:

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