Friday January 7th

Using your prior knowledge of genetics, explain how two brown

rabbits could have white offspring.

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Brain Pop Video

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Goal #1:GregorMendel

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I. Heredity = the passing of traits from parent to offspring

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A. Concepts of heredity 1. genes determine traits

2. genes are found on chromosomes 3. genes are made up of DNA 4. genes separate during meiosis

- each gamete receives

different genes (some from mom, some from dad)

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For Example:• You may have

attached earlobes• But your

brother/sister may have free earlobes

• This means the gene for earlobes took on one form of a trait for one of you and another form for your brother/sister.

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B. Alleles: different forms of a gene for a trait a. alleles separate into sex cells during meiosis b. can be dominant or recessive (A or a)

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C. Traits:characteristics that vary between individuals

What are some examples of traits?

ex: hair color, eye color, etc.

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D. Genetics: the study of how alleles affect generations of offspring

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II. Father of genetics: Gregor Mendel

A. History 1. He was a monk2. Experimented with pea plants

3.Died in 1884 with no recognition for his scientific discoveries.

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B. Mendel’s experiments 1.Mendel chose peas because they were easy to breed for pure traits.2. Purebreed (true-breed): organisms that always produce the same traits.

Ex: tall plants always

produce tall plants

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3. Self-pollination: taking pollen from the male reproductive structures (anthers) and placing it on the female reproductive structures (stigma) on the SAME plant– 1 parent:

offspring are identical to parent

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4. Cross-pollination: taking pollen from the male reproductive structures and placing it on the female reproductive structures on a DIFFERENT plant. – 2 parents – offspring not always

identical to parents– hybrids: crosses of different

parents that have different traits

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a. Mendel crossed a parent generation (P1), of a pure tall plant with a pure short plant. –offspring

called the first filial generation (F1)

–Results: ALL tall plants.

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b. Mendel then crossed these offspring (the 1st generation, the F1) of all tall plants and planted the seeds. – new offspring

called the second filial generation (F2),

– Results: 3 tall plants and 1 short plant (3:1)

How did this occur?

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C. Mendel’s Principle of Dominance

1. Dominance: form of a trait that masks another form of a trait –P 2. Recessive: form of a trait that is masked - p

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III. Probability: science that helps determine the chance that something will take place.a. multiple trials provide more accurate results. b. Scientific research is based on accurate, repeatable results.

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C#1: Gregor MendelConstruct a flowchart on Mendel’s Methods for breeding pea plants. Include as many vocab words as possible. Include P1 and F1 crosses and results 5

Create a diagram/picture on Mendel’s principles of dominance and segregation. Describe why it is important for alleles to segregate during gamete formation (meiosis).

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Create a collage comparing Mendel’s Laws. Use Goal #1 – be creative and use your own imagination

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11-1 Section Assessment – must be in complete sentences5

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