Gene Jury

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Gene Jury
Single Gene Cross
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Living thing! Wee baldy sheep
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size gene (wee)
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Every animal has two sets of genes, One from its
mum and one from its dad
Genes from dad
Genes from mum
size gene
size gene
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What will the sheep look like?
big
wee
Size gene big dominant
A
B
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Lambing season
You and your partner are going to be two sheep
parents, making a lamb together. Each parent has
genes and needs a card pack. All animals have
two versions of each gene, one from their mum and
one from their dad. We will look at size genes
today. Each remove the two size gene cards from
the pack and place them coloured side up on the
table. Leave the other cards in the pack.
Each choose one size gene card this makes a
gamete.
Make a lamb by combining the gamete with your
partners
Turn over the cards to see which gene
characteristics (allelles) your lamb will carry
Record your lambs gene characteristics on your
sheet
LAMB
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Now take your own cards back. Repeat the lambing
process to make a second lamb
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What did your lambs look like?
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Lets work out the ratio of different lambs.
In your pairs one of you vote for lamb 1 the
other vote for lamb 2.
A
B
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