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MENDEL

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MENDEL S LEGACY CH. 9 Gregor Mendel (1823-1884) Mendel taught natural science to High School Students. Once: he crossed peas and mice of different varieties for ... – PowerPoint PPT presentation

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Title: MENDEL


1
MENDELS LEGACY
  • CH. 9

2
Gregor Mendel (1823-1884)
The Father of Modern Genetics!
3
Mendel taught natural science to High School
Students.
  • Once he crossed peas and mice of different
    varieties for the fun of the thing

4
  • He determined several laws of inheritance....
  • Mendels work became the foundation for Modern
    Genetics.

5
Mendels peas
  • MENDEL chose a common garden pea (Pisum) for his
    first experiments in hybridization

6
Mendels Procedure
  • Step ONE find plants that are pure for one
    trait (like height).
  • Call them P1

7
  • Step TWO take opposites for the trait (like tall
    X short) cross pollinate/fertilize

8
  • Step 3 grow offspring and record results. (F1
    filial offspring)

9
  • Step 4 Allow self-pollination grow the
    grandchildren of P1. Call this group F2. Record
    results.

10
  • P1 HH (tall) X hh (short)
  • Results All F1 grew tall!
  • F1 X F1 F2
  • Results, 3/4th peas were tall, 1/4th peas were
    short!

11
Mendel discovered...
  • ...some traits are masked...they are RECESSIVE
    and may skip generations.
  • ...some traits are DOMINANT...they occur often in
    the population.

12
  • ...traits are determined by a pair of factors.
  • Alleles

13
Mendel determined...
  • The pair of factors are sorted independently of
    each other.
  • These factors are separated when the gametes are
    formed.

14
HOW TO PLAY GENETICS GAMES
  • Traits are expressed as letters of the alphabet.
  • HH or hh
  • Capital letters denote dominant traits

15
  • HH or hh are pure strains. They are called
    HOMOZYGOUS
  • Hh are mixed strains....carriers of the recessive
    gene, but do not look recessive. They are called
    HETEROZYGOUS

16
EXAMPLES
  • H TALL
  • h short
  • HH homozygous tall
  • hh homozygous short
  • Hh heterozygous tall

17
More vocabulary....
  • genotype the letters we use to express traits
    genetic makeup
  • phenotype what something looks like.

18
Phenotypes
fat pod, smooth peas
19
or...
  • skinny pods, wrinkled peas
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