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Course: Edexcel A Level Biology A (SNAB) 9BI0
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Edexcel A Level Biology A (SNAB) 9BI0

Topic 1 · Lifestyle, Health and Risk

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Topic 2 · Genes and Health

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Topic 3 · Voice of the Genome

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Topic 4 · Biodiversity and Natural Resources

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Topic 5 · On the Wild Side

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Topic 6 · Immunity, Infection and Forensics

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Topic 7 · Run for your Life

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Topic 8 · Grey Matter

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Quiz

3.3.4 Meiosis- Source of Genetic Variation – Exam questions

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  • Questions count: 12
  • Passing grade: B+
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1.
Compare: Quantity A is the number of chromosomes in a human cell produced by mitosis of a skin cell; Quantity B is the number of chromosomes in a human cell produced by meiosis. Which is correct?
Quantity A is greater
Quantity B is greater
The two quantities are equal
The information given is insufficient
2.
Meiosis has all of the following features EXCEPT:
Homologous chromosomes separate in anaphase I
It produces four haploid cells
Crossing over occurs between non-sister chromatids
It produces two cells genetically identical to the parent cell
3.
Which pairing of source of variation and stage is correct?
Crossing over — anaphase II
Independent assortment — metaphase I
Random fertilisation — prophase I
Independent assortment — telophase II
4.
Which statement best describes Genetic variation?
Differences between individuals; the raw material of natural selection.
Failure of chromosomes to separate, giving gametes with the wrong number.
A matching pair, one from each parent, carrying the same genes.
Two divisions that produce four cells with half the chromosome number.
5.
Which process does NOT increase genetic variation?
Crossing over
Independent assortment
Random fertilisation
Mitosis
6.
Which statement best describes Genetic diversity?
Which statement best describes Genetic diversity?
Random orientation of homologue pairs.
Variation in alleles within a population.
Failure of chromosomes to separate.
Any sperm can fuse with any egg.
7.
Which key term matches this description: "Chromosome with new allele combination."
Which key term matches this description: "Chromosome with new allele combination."
Nondisjunction
Independent assortment
Crossing over
Recombinant chromosome
8.
According to the comparison table in this lesson, what is the Mechanism of Mutation?
According to the comparison table in this lesson, what is the Mechanism of Mutation?
Sources of genetic variation
DNA change
Random orientation
Segments exchanged
Any gamete pair
9.
Which statement best describes Random fertilisation?
Which statement best describes Random fertilisation?
Any sperm can fuse with any egg.
Chromosome with new allele combination.
Failure of chromosomes to separate.
Random orientation of homologue pairs.
10.
Which step comes first in the sequence covered in this lesson?
Which step comes first in the sequence covered in this lesson?
Independent assortment
Random fertilisation
Crossing over
Unique offspring
11.
Complete the statement: Independent assortment occurs in ______.
Complete the statement: Independent assortment occurs in ______.
metaphase I
Crossing over
Random fertilisation
prophase I
12.
Meiosis produces genetic variation.
True
False
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Part of Topic 3 · Voice of the Genome — see every lesson and quiz in this unit.
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