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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2:13 minutes

Problem 8d

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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Understand the law of segregation: This law states that during gamete formation, the two alleles for each gene separate so that each gamete carries only one allele for each gene. It applies to the inheritance of a single gene.

Recognize that a trihybrid cross involves three genes, each with two alleles. While the law of segregation applies to each individual gene, it does not predict the overall outcome of a trihybrid cross.

Identify the correct principle for predicting the outcome of a trihybrid cross: The law of independent assortment is the key principle here. It states that alleles of different genes assort independently during gamete formation, provided the genes are on different chromosomes or far apart on the same chromosome.

Revise the statement: The outcome of a trihybrid cross is predicted by the law of independent assortment, not solely by the law of segregation.

Conclude that the statement is false and provide the corrected version: 'The outcome of a trihybrid cross is predicted by the law of independent assortment, which works in conjunction with the law of segregation for each gene.'

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Key Concepts

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

Law of Segregation

The Law of Segregation, proposed by Gregor Mendel, states that during the formation of gametes, the two alleles for a trait separate, so that each gamete carries only one allele for each gene. This principle is fundamental in understanding how traits are inherited and is crucial for predicting the outcomes of genetic crosses.

Trihybrid Cross

A trihybrid cross involves the genetic crossing of organisms that differ in three traits, each controlled by different genes. This type of cross allows for the examination of the inheritance patterns of multiple traits simultaneously, and the expected phenotypic ratio from a trihybrid cross is typically 27:9:9:9:3:3:1, assuming independent assortment.

Law of Independent Assortment

The Law of Independent Assortment states that alleles for different traits segregate independently of one another during gamete formation. This principle is essential for understanding the outcomes of dihybrid and trihybrid crosses, as it allows for the combination of traits in offspring that are not influenced by the inheritance of other traits.

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Related Practice

Multiple Choice

Suppose a geneticist is using a three-point testcross to determine the order of three linked genes on a chromosome. Which of the following outcomes would provide the most information about gene order?

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

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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?

419

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Textbook Question

Calculate the recombination frequencies between the gene pairs.

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