Chapter 10.1: Mendel - PowerPoint PPT Presentation

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Chapter 10.1: Mendel

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Chapter 10.1: Mendel Gregor Mendel Father of genetics Studied heredity Passing on of traits from parent to offspring Gregor Mendel cont Genetics the study of ... – PowerPoint PPT presentation

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Title: Chapter 10.1: Mendel


1
Chapter 10.1 Mendel
2
Gregor Mendel
  • Father of genetics
  • Studied heredity
  • Passing on of traits from parent to offspring

3
Gregor Mendel cont
  • Geneticsthe study of heredity

4
Gregor Mendel cont
  • Traitscharacteristics that are inherited
  • Ex Height, Hair color, breast cancer

5
Gregor Mendel cont
  • Mendel studied pea plants
  • Reproduce sexually
  • Have two sex cells (gametes)
  • One male, one female

6
Garden peas cont
  • Both sex cells in same flower
  • Male sex cell pollen
  • Female sex cell ovule

7
Garden Peas Cont
  • Pollinationhow plants reproduce
  • Transfer pollen to ovule
  • Fertilizationcombining the male and female sex
    cells
  • Result seed (baby plant)

8
Garden Peas Cont
  • Plants usually self-pollinate
  • Male and female gametes of same flower combine
  • Mendel used cross pollination
  • Male of one flower combines with female of
    another flower

9
Punnett Squares
  • Hybrida child whose parents had different traits
  • Ex Dad is tall and mom is short
  • Kid is hybrid for height

10
Monohybrid Cross
  • Punnett square for one trait
  • Ex Tt x Tt
  • Results 31 ratio

11
Monohybrid Cross cont
  • Traits are found on genes which make up
    chromosomes
  • Allelesdifferent genes
  • Ex T or t (T tall, t short)

12
Rule of Dominance
  • All humans have both dominant and recessive
    alleles
  • Dominanttrait that shows up
  • Ex T tall or B brown hair
  • Recessivetrait that is normally hidden
  • Ex t short or b blonde hair

13
Rule of Dominance cont.
  • Only time you see a recessive trait is when both
    parents give you the recessive
  • Ex tt short or bb blonde hair

14
Law of Segregation
  • Parents dont control what genes they give their
    kids

15
Vocabulary
  • Phenotypein words, what your traits are
  • Ex Tall, short, has breast cancer

16
Vocab cont
  • Genotypein letters, what your traits are
  • Ex TT, Tt, tt

17
Vocab cont
  • Homozygous2 alleles for a trait are the same
  • Could be dominant TT
  • Could be recessive tt

18
Vocab cont
  • Heterozygous2 alleles for a trait are different
  • Only dominant Tt

19
Law of Independent Assortment
  • All traits are inherited separately
  • Ex All blonde hairs dont have blue eyes

20
Probability
  • The likelihood of something happening
  • Ex Chances of having a boy vs. a girl 50
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