Biology  by Bradford
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5.1 Meiosis: revision map

The subtopic in the middle and five tasks round it: label two diagrams, complete a table, put a process in order and fill 13 gaps. Every box rests on a learning objective of the topic in the AP Biology course and exam description. Type into the blanks and check them, or print it on A4, Letter or A3 with an answer key.

Unit 5 practice questionsThe whole Unit 5 map

Topic 5.1

Meiosis

AP Biology ยท Unit 5 HeredityName

5.1.A, 5.1.BTwo divisions, four cells

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5.1.ASets of chromosomes

A diploid cell has two sets of chromosomes, one from each parent, so it has pairs of chromosomes. Meiosis halves the number to give gametes with one chromosome of each pair. At fertilization two gametes fuse, restoring the diploid number in the zygote. Without the halving, the chromosome number would double in every generation.

5.1.BCrossing over

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Topic 5.1Meiosis

5.1.AMitosis and meiosis

MitosisMeiosis
Rounds of divisionone
Cells produced2, diploid and identical, haploid and different
Homologs pair up?no, and cross over
Used forgrowth, repair, asexual reproductionmaking gametes

5.1.AMeiosis in order

Number the steps in order.

  1. Sister chromatids separate in meiosis II, giving four haploid cells.
  2. Homologous pairs line up at the center and separate in anaphase I: meiosis I is reductional.
  3. Two haploid cells form, each with duplicated chromosomes.
  4. DNA is replicated in S phase, so each chromosome has two sister chromatids.
  5. Homologous chromosomes pair up and cross over in prophase I.
Word bank 4centromerecrossing overdiploid cellhaploidhaploid cellhomologoushomologous chromosomesnonsister chromatidssister chromatidstwoyes

Answer key

Every box on the sheet with its gaps filled in, as the subtopic reads in full.

  1. LabelTwo divisions, four cells

    1. homologous chromosomes
    2. sister chromatids
    3. haploid cell
    4. diploid cell

  2. LabelCrossing over

    1. sister chromatids
    2. crossing over
    3. centromere
    4. nonsister chromatids

  3. TableMitosis and meiosis

    MitosisMeiosis
    Rounds of divisiononetwo
    Cells produced2, diploid and identical4, haploid and different
    Homologs pair up?noyes, and cross over
    Used forgrowth, repair, asexual reproductionmaking gametes

  4. OrderMeiosis in order

    1. DNA is replicated in S phase, so each chromosome has two sister chromatids.
    2. Homologous chromosomes pair up and cross over in prophase I.
    3. Homologous pairs line up at the center and separate in anaphase I: meiosis I is reductional.
    4. Two haploid cells form, each with duplicated chromosomes.
    5. Sister chromatids separate in meiosis II, giving four haploid cells.

  5. GapsSets of chromosomes

    A diploid cell has two sets of chromosomes, one from each parent, so it has pairs of homologous chromosomes. Meiosis halves the number to give haploid gametes with one chromosome of each pair. At fertilization two gametes fuse, restoring the diploid number in the zygote. Without the halving, the chromosome number would double in every generation.