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Section 1: Mendel and His Peas

Cells: Chapter 3

Amber Wira

on 11 September 2012

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Transcript of Section 1: Mendel and His Peas

What are 3 traits that you inherited
from your parents or
guardians? Write your
answer in your notebook.
Then, read pages 56-61. "DO NOW" Chapter 3, Section 1: Mendel and His Peas: The passing of traits from parents to offspring. Heredity Garden Pea Plants Mendel found patterns in generations during his studies. He studied two different types of pollination:
Cross-pollination A plant with both male and female reproductive structures Self-Pollination: The pollen from one flower can fertilize
the ovule of the same plant or another
flower on the same plant. Why is it important for plants to self-pollinate? Mendel was able to grow true-breeding

When true-breeding plants self-pollinate,
ALL of the offspring have the same trait
as the parent. Pollination from one plant fertilizes the ovule of a flower on a different plant. Cross pollination Name two ways
pollen can travel. What is the difference
between a
and a
characteristic? First Experiment: Mendel crossed pea plants with 7 different
characteristics. He used plants that were
true-breeding for different traits. He crossed plants with purple flowers with
plants with white flowers. ALL of the 1st generation plants had
purple flowers. WHY? Dominant vs. Recessive Traits: Dominant Trait: the trait that is observed in the first generation when breeding occurs with parents of different traits. (In this case, Purple flowers) Recessive Trait: the trait that is not shown in
the first generation, but can reappear in the second generation when parents with different traits are bred. What is the result of the offspring? Second Experiment Mendel allowed the first generation
plants to self-pollinate (all purple flowers) The results were always 3 purple flowers
and 1 white flower. Which trait is dominant and which is
recessive? How do you know? Complete directed reading from this section.

You may work with a partner, but you
both must complete your own directed

If you do not finish the directed reading in class, it is HOMEWORK.
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