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Crossing Over & Gene Linkage: Definition, Importance & Results Video

Instructions:

Choose an answer and hit 'next'. You will receive your score and answers at the end.

question 1 of 3

Genes A and B are located on the same chromosome arm in the following orientation: centromere, gene A, gene B, telomere. Which of the following recombinant chromatids could be produced by a crossover event between B genes in a heterozygote in which the dominant alleles are linked on one homolog and the recessive ones are linked on the other homolog?

I. A B

II. a B

III. A b

IV. a b

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1. Alleles A, B, C and D are linked on one chromosome, and alleles a, b, c and d are linked on the homolog. During meiosis, a crossover event occurs between genes A and B. Which of the following is an example of a chromatid that could be found in one of the resulting gametes?

2. Alleles A and B are linked on chromosome 1 (such that you have A-B and a-b). Alleles C and D are linked on chromosome 2 (you have C-D and c-d). If a crossover event does not occur between either set of genes, which gamete genotype could NOT be produced by an individual heterozygous at each locus?

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About This Quiz & Worksheet

This quiz/worksheet combo will help to challenge your knowledge of chromosomal linkage and crossing over. Practice problems in the quiz involve crossing chromatids.

Quiz & Worksheet Goals

Topics you will need to know for the quiz include:

  • Two genes on the same chromosome
  • True statements about alleles
  • Example gametes that would result from a given crossover

Skills Practiced

This tool can also be used to practice these skills:

  • Reading comprehension - ensure that you draw the most important information from the related lesson on what two genes on the same chromosome are
  • Problem solving - use acquired knowledge to solve practice problems relating to alleles and chromosomes
  • Interpreting information - verify that you can read information regarding what is true about alleles and interpret it correctly

Additional Learning

Please review the lesson entitled Chromosomal Linkage and Crossing Over for more detail on this topic. Some objectives the lesson goes over are:

  • Define linked chromosomes and crossing over
  • Understand how crossing over is possible
  • Understand how crossing over effects genotypes and corresponding phenotypes
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