biology - chp 18 - dichotomous key - powerpoint

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Dichotomous Key Notes

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Page 1: Biology - Chp 18 - Dichotomous Key - PowerPoint

Dichotomous Key Notes

Page 2: Biology - Chp 18 - Dichotomous Key - PowerPoint

Dichotomous Key• Key used to identify an

organism by choosing from pairs of descriptions of characteristics of the organism

Page 3: Biology - Chp 18 - Dichotomous Key - PowerPoint

Rules for using a dichotomous key

1. Always start at the top

2. Compare one organism at a time, read the choice and decide if yes or no.

3. Follow next step and eliminate options until its narrowed down to just one

Page 4: Biology - Chp 18 - Dichotomous Key - PowerPoint

Practice with this picture

Page 5: Biology - Chp 18 - Dichotomous Key - PowerPoint

Jay A

Page 6: Biology - Chp 18 - Dichotomous Key - PowerPoint

Jay B