Mendel's Second Law: The Law of Independent Assortment


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You could draw which of the following conclusions from a dihybrid cross which produces a 9:3:3:1 ratio of phenotypes?

I. The alleles of one gene sort independently of another gene.

II. The alleles of the two genes in question exhibit a simple dominant/recessive relationship.

III. The animals which were crossed were both homozygous with respect to at least one locus in question.

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Which of the following statements is true?

I. A dihybrid cross is a cross between individuals heterozygous at one gene.

II. The law of independent assortment describes the relationship between alleles of a single gene.

III. The law of segregation describes the manner in which genes on different chromosomes segregate.

IV. Homologous chromosomes segregate into different gametes.

2. The law of independent assortment states that:

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About This Quiz & Worksheet

The Law of Independent Assortment, Mendel's second law, states that the alleles of one gene sort into the gametes independently of the alleles of another gene. This quiz and worksheet combination will help you sort through and unpack what is meant by that statement. The quiz questions will test you on phenotype ratios and how chromosomes segregate.

Quiz & Worksheet Goals

In these assessments, you'll be tested on:

  • Drawing conclusions about a dihybrid cross given the phenotype ratio
  • Your understanding of homologous chromosomes, dihybrid crosses, and the law of segregation

Skills Practiced

This quiz and worksheet will allow you to test your skills in the following areas:

  • Reading comprehension - ensure that you draw the most important information on Mendel's second law from the related lesson
  • Interpreting information - verify that you can read information on genetics and interpret it correctly
  • Defining key concepts - ensure that you can accurately define main concepts, such as alleles, genes, and a dihybrid cross

Additional Learning

Read the related lesson called Mendel's Second Law: The Law of Independent Assortment for more information about this complicated subject. This lesson covers the following objectives:

  • Define Mendel's second law
  • Understand the sample experiment and how it demonstrates Mendel's second law
  • Understand how chromosomes segregate and how to draw conclusions based on phenotype ratio