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Free Practice Quiz Question List

3 Chromosomes, Meiosis, and Linkage Online Quiz Questions

Use this free practice quiz with 20 questions to review 3 Chromosomes, Meiosis, and Linkage, test your knowledge, and prepare for your next test or exam.

20 questions
01
True or false
1 point

True or false: Homologous chromosomes carry the same genes at corresponding loci, but they can carry different alleles.

  1. A

    True

  2. B

    False

02
Choose one
1 point

Which event takes place during meiosis II?

  1. A

    Homologous chromosomes separate during meiosis II.

  2. B

    Sister chromatids separate during meiosis II.

  3. C

    DNA replication occurs between meiosis I and meiosis II.

  4. D

    Meiosis II reduces the chromosome number by half.

03
Written response
1 point

A genetic variant is described by its position on a chromosome, regardless of which allele is present. What is that position called?

04
Fill in the blank
1 point

Complete the statements: Meiosis I separates , while meiosis II separates .

05
Choose all
1 point

Select all statements that correctly describe eukaryotic chromosome structure.

  1. A

    Chromatin consists of DNA and associated proteins.

  2. B

    Histones are proteins involved in packaging DNA.

  3. C

    Telomeres are the regions that join sister chromatids.

  4. D

    A locus is a gene's position on a chromosome.

06
True or false
1 point

True or false: Genes on the same chromosome are always inherited together, even when crossing over occurs between them.

  1. A

    True

  2. B

    False

07
Choose one
1 point

Before considering crossing over, how many combinations of whole chromosomes can independent assortment produce from a cell with four chromosome pairs?

  1. A

    4

  2. B

    8

  3. C

    16

  4. D

    32

08
Fill in the blank
1 point

Complete the statements: Crossing over occurs during and exchanges DNA between .

09
Choose one
1 point

An individual's homologs carry the allele combinations ABAB and abab. If crossing over occurs between the two loci, which pair of allele combinations can be produced as recombinants?

  1. A

    ABAB and abab

  2. B

    AbAb and aBaB

  3. C

    AAAA and bbbb

  4. D

    AaAa and BbBb

10
Written response
1 point

In a testcross, 24 of 160 offspring are recombinant. What is the recombination frequency? Enter the percentage-point value without a percent sign.

11
Choose all
1 point

Select all statements that are supported about linkage and recombination frequency.

  1. A

    Nearby loci are less likely to be separated by crossing over than loci farther apart.

  2. B

    Loci with a recombination frequency near 50% behave as if unlinked.

  3. C

    Recombination frequency can exceed 50% when many crossovers occur.

  4. D

    For nearby loci, 1% recombination is approximately 1 map unit or 1 cM.

12
Choose one
1 point

During meiosis, a chromosome pair fails to segregate correctly. Which outcome is a possible consequence of this nondisjunction?

  1. A

    The gametes are guaranteed to be diploid.

  2. B

    Crossing over cannot occur in any of the cells.

  3. C

    Some resulting gametes may have an extra or missing chromosome.

  4. D

    The gametes receive one chromosome from every homologous pair without exception.

13
Open ended
1 point

Explain how independent assortment and crossing over differ in the way they create new combinations of parental DNA during meiosis. Include where each occurs and what is being rearranged.

14
Choose one
1 point

After a chromosome is copied before cell division, what are the two identical DNA molecules joined at its centromere called?

  1. A

    Homologous chromosomes

  2. B

    Sister chromatids

  3. C

    Nonsister chromatids

  4. D

    Telomeres

15
True or false
1 point

True or false: In meiosis I, sister chromatids separate and move to opposite poles.

  1. A

    True

  2. B

    False

16
Choose one
1 point

How does the independent orientation of homologous chromosome pairs in meiosis I contribute to genetic variation?

  1. A

    It makes sister chromatids genetically identical in every case.

  2. B

    It causes homologous chromosomes to remain together through both meiotic divisions.

  3. C

    It allows different combinations of maternal and paternal homologs to enter gametes.

  4. D

    It ensures that each gamete receives both homologs of every pair.

17
Choose one
1 point

During prophase I, which structures exchange corresponding DNA segments during crossing over?

  1. A

    Nonsister chromatids of paired homologous chromosomes

  2. B

    Sister chromatids of the same chromosome only

  3. C

    Chromatids from unrelated chromosome pairs

  4. D

    The two centromeres of a homologous pair

18
Choose one
1 point

Two genes are located on the same chromosome. Which statement best describes their usual inheritance pattern?

  1. A

    They are always inherited independently.

  2. B

    They occur only in haploid gametes.

  3. C

    They occupy the same locus on homologous chromosomes.

  4. D

    They are on the same chromosome and tend to be inherited together.

19
Written response
1 point

An individual's homologs carry the allele combinations AB and ab. A crossover occurs between the two loci. Enter the two recombinant allele combinations in the order shown, separated by a comma.

20
Written response
1 point

A diploid species has 12 homologous chromosome pairs. An egg and a sperm from this species each contribute one chromosome from every pair. How many chromosomes will the resulting zygote have?