A LEVEL AQA BIOLOGY MEIOSIS
REVISION PAPER 2023 WITH CORRECT
QUESTIONS AND ANSWERS
Meiosis (Correct Answers) The type of nuclear division in which the number of
chromosomes is halved.
Gamete (Correct Answers) Reproductive (sex) cell that fuses with another gamete
during fertilisation
Diploid (Correct Answers) Cell or nucleus containing pairs of homologous chromosomes
(two sets of chromosomes)
Haploid (Correct Answers) Cell or nucleus containing single, unpaired chromosomes (a
single copy of each chromosome)
Homologous chromosomes (Correct Answers) A pair of chromosomes, one maternal
and one paternal, that have the same gene loci and therefore determine the same
features. They are not necessarily identical as may have different alleles. They are
capable of pairing during meiosis.
Crossing over (Correct Answers) The process whereby a chromatid breaks during
meiosis and rejoins to the chromatid of its homologous chromosome so that their alleles
are exchanged
Chiasmata (Correct Answers) A point at which paired chromosomes remain in contact
during the first metaphase of meiosis and at which crossing over and exchange of
genetic material occur between the strands.
Recombination (Correct Answers) The rearrangement of genetic material, especially by
crossing over in chromosomes.
Independent assortment (Correct Answers) The alleles of two (or more) different genes
get sorted into gametes independently of one another. The allele a gamete receives for
one gene does not influence the allele received for another gene. This is because
homologous chromosomes line up in random orientations at the middle of the cell at
metaphase as they prepare to separate, meaning that the same parent cell can produce
different combinations of chromosomes in the daughter cells.
REVISION PAPER 2023 WITH CORRECT
QUESTIONS AND ANSWERS
Meiosis (Correct Answers) The type of nuclear division in which the number of
chromosomes is halved.
Gamete (Correct Answers) Reproductive (sex) cell that fuses with another gamete
during fertilisation
Diploid (Correct Answers) Cell or nucleus containing pairs of homologous chromosomes
(two sets of chromosomes)
Haploid (Correct Answers) Cell or nucleus containing single, unpaired chromosomes (a
single copy of each chromosome)
Homologous chromosomes (Correct Answers) A pair of chromosomes, one maternal
and one paternal, that have the same gene loci and therefore determine the same
features. They are not necessarily identical as may have different alleles. They are
capable of pairing during meiosis.
Crossing over (Correct Answers) The process whereby a chromatid breaks during
meiosis and rejoins to the chromatid of its homologous chromosome so that their alleles
are exchanged
Chiasmata (Correct Answers) A point at which paired chromosomes remain in contact
during the first metaphase of meiosis and at which crossing over and exchange of
genetic material occur between the strands.
Recombination (Correct Answers) The rearrangement of genetic material, especially by
crossing over in chromosomes.
Independent assortment (Correct Answers) The alleles of two (or more) different genes
get sorted into gametes independently of one another. The allele a gamete receives for
one gene does not influence the allele received for another gene. This is because
homologous chromosomes line up in random orientations at the middle of the cell at
metaphase as they prepare to separate, meaning that the same parent cell can produce
different combinations of chromosomes in the daughter cells.
