Cell Division And Inheritance Worksheet - Review B2.7
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1Review B2.7 Cell division and inheritance
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B2.7.1 Cell division
Identify where pairs of chromosomes (which contain genetic information) are normally
found in body cells
Describe how body cells divide by mitosis, including copying of the genetic material and
division to form two identical body cells
State that mitosis occurs during growth or to produce replacement cells
Compare the number of chromosomes in body cells and sex cells (gametes)
Identify the reproductive organs as testes and ovaries
State that meiosis is the type of cell division that forms gametes
(HT) Describe meiosis in terms of copying of genetic material, followed by the cell
diving twice to form four different gametes
Describe the process of fertilisation
Interpret genetic diagrams, including family trees
Define the term ‘differentiation’
Describe when differentiation occurs in plants and animals
Identify human embryo and bone marrow cells as stem cells, and describe how they can
be used
Give an example of a condition that could be treated using stem cells
Describe how asexual reproduction leads to the production of offspring with the same
alleles as the parents
B2.7.2 Genetic variation
Define the term ‘allele’
Explain how sexual reproduction leads to variation, in terms of alleles
Describe how a single pair of chromosomes in humans determines sex, and identify the
chromosome pairings in males and females
Define the term ‘dominant allele’
Define the term ‘recessive allele’
Describe the shape of the DNA molecule as a double helix
(HT) Explain how genes code for combinations of amino acids in proteins
Explain why DNA fingerprinting can be used to identify individuals, using the idea of
unique DNA
(HT) Construct genetic diagrams and predict the outcomes of crosses, using the terms
‘homozygous’ ‘heterozygous’ ‘phenotype’ and ‘genotype’
Predict or explain the outcome of crosses between individuals for any combination of
dominant and recessive alleles
Make informed judgements about the social and ethical issues concerning the use of
stem cells from embryos in medical research and treatments
B2.7.3 Genetic disorders
Identify some disorders as inherited
Describe how polydactyly – caused by a dominant allele – is inherited
Describe how cystic fibrosis – caused by a recessive allele – is inherited, and explain why
an individual may be a ‘carrier’ without having the disorder themselves
Evaluate the economic, social and ethical issues surrounding embryo screening to test for
alleles that cause genetic disorders
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