In Australia, Merino sheep are kept for their wool. The best quality wool has
especially thin fibres,
An experiment was carried out to find out whether genes, the environment or both
have an effect on the thickness of the fibres.
Two groups of 20 sheep were used. Group A had wool with thin fibres. They
came from a breeding herd that always produced sheep with thin fibres.
Group B had wool with thicker fibres. They came from a breeding herd that
always produced sheep with thicker fibres.
In the experiment, 10 sheep from Group A were kept in a hot, dry part of
Australia. The other 10 sheep from Group A were kept in a cooler, wetter part.
The same was done with the sheep from Group B.
After two years in these environments, the diameters of a sample of wool
fibres from each group of sheep were measured and the mean diameters were
calculated. The results are shown in the table. Tell how the results of the experiment confirm the idea that genes affect the diameter of wool fibres.
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