Biology department
Grade – 7 Work sheets
Student`s name : ……………………………………………..
3.10 Genes
3.10.1 Variation
A- Fill in the blanks :
Variation – species - genes – characteristic feature
• …………….. Differences between individuals of the same species.
• …………………………..… A different variation between members of the same species .
• The differences between species occur because their ………….. are very different .
• ……………………is a group of organisms of the same type that can breed with each other to
form children (offspring) .
B- Look at the following picture .
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Explain how genes cause variation.
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