Transcript Controlling plant growth - mrryanscience

Making a baby
Know about the numbers of chromosomes. (F)
Know how genes control who you are. (F)
Know about clones. (F)
Starter: How do one sperm and one egg decide how
you look? Write down your ideas.
Key words
• Using the text book (page 40-43) find out what
these words mean:
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DNA
Chromosome
Gene
Sperm
Egg
Fertilisation
• Use the glossary at the back of the book if you
get stuck.
Stages of fertilisation
Cloning plants
• Plants can be cloned by taking a
cutting.
• This involves cutting a part of a
plant off then dipping it in rooting
powder.
• Each part of a plant can make an
entirely new plant.
• In terms of genes, why will the new
plant be the same as the original
plant?
• The new plant will be the same as the
original plant because:
Cuttings
• The new plant will be the
same as the original plant
because there are no new
genes being introduced into
the plant, this means all
it’s characteristics must
come from the genes that were
in the original plant.
Chromosome numbers
Mother’s
cells
Father’s
cells
46 chromosomes each
Egg
Sperm
23 chromosomes
each
Charlotte’s
cell
46 chromosomes in body cells
Work to do
• Answer questions 12, 13 and
15 from pages 42 & 43.
Making a baby
Know about the numbers of chromosomes. (F)
Know how genes control who you are. (F)
Know about clones. (F)
Plenary: Draw a comic strip to show how fertilisation
occurs - include chromosome numbers.
Fertilisation comic
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