Your SlideShare is downloading. ×
0
Gregor Mendel & Punnett Squares
Gregor Mendel & Punnett Squares
Gregor Mendel & Punnett Squares
Gregor Mendel & Punnett Squares
Gregor Mendel & Punnett Squares
Gregor Mendel & Punnett Squares
Gregor Mendel & Punnett Squares
Gregor Mendel & Punnett Squares
Gregor Mendel & Punnett Squares
Gregor Mendel & Punnett Squares
Gregor Mendel & Punnett Squares
Gregor Mendel & Punnett Squares
Gregor Mendel & Punnett Squares
Gregor Mendel & Punnett Squares
Gregor Mendel & Punnett Squares
Gregor Mendel & Punnett Squares
Gregor Mendel & Punnett Squares
Gregor Mendel & Punnett Squares
Gregor Mendel & Punnett Squares
Gregor Mendel & Punnett Squares
Gregor Mendel & Punnett Squares
Gregor Mendel & Punnett Squares
Gregor Mendel & Punnett Squares
Gregor Mendel & Punnett Squares
Gregor Mendel & Punnett Squares
Gregor Mendel & Punnett Squares
Gregor Mendel & Punnett Squares
Upcoming SlideShare
Loading in...5
×

Thanks for flagging this SlideShare!

Oops! An error has occurred.

×
Saving this for later? Get the SlideShare app to save on your phone or tablet. Read anywhere, anytime – even offline.
Text the download link to your phone
Standard text messaging rates apply

Gregor Mendel & Punnett Squares

16,107

Published on

Published in: Lifestyle
0 Comments
1 Like
Statistics
Notes
  • Be the first to comment

No Downloads
Views
Total Views
16,107
On Slideshare
0
From Embeds
0
Number of Embeds
0
Actions
Shares
0
Downloads
239
Comments
0
Likes
1
Embeds 0
No embeds

Report content
Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
No notes for slide

Transcript

  • 1. 11.1-11.2 Gregor Mendel &Punnett Squares Pages 262 - 266 PD -old
  • 2. Goal 1 Describe how Mendel Studied inheritance in peas
  • 3. <ul><li>Austrian Monk 1800’s </li></ul><ul><li>Taught High School </li></ul><ul><li>Managed monastery gardens </li></ul>
  • 4. <ul><li>Pea plant observations </li></ul><ul><li>True-breeding plants </li></ul><ul><ul><li>Self pollination = offspring identical to parents </li></ul></ul>
  • 5. <ul><li>Cross pollination used to study inheritance </li></ul><ul><ul><li>Tall plant x short plant </li></ul></ul><ul><ul><li>Green seeds x yellow seeds </li></ul></ul>
  • 6. Goal 2 Summarize Mendel’s conclusions about inheritance
  • 7. <ul><li>Results of Mendel’s experiment </li></ul><ul><ul><li>Cross pollination of true breeding parents (P) </li></ul></ul><ul><ul><li>Offspring (F1) only show one trait </li></ul></ul><ul><ul><li>No “blending” of traits </li></ul></ul>Tall plant x short plant = all tall plants P P F1
  • 8. <ul><li>Mendel’s 1 st conclusions about inheritance </li></ul><ul><ul><li>Inheritance determined by factors passed from one generation to the next </li></ul></ul><ul><ul><li>Each trait determined by one gene that occurs in two different forms ( alleles ) </li></ul></ul><ul><ul><li>Trait of height located on one gene as either short or tall alleles </li></ul></ul>
  • 9. Goal 3 Explain the principle of dominance
  • 10. <ul><li>He tried again with F1 generation </li></ul><ul><ul><li>Cross pollination of F1 offspring </li></ul></ul><ul><ul><li>¾ F2 offspring show one trait ¼ F2 show “hidden” trait </li></ul></ul>F1 x F1 = F2 Tall plant x Tall plant = 3/4 tall plants ¼ short plants
  • 11. Creative commons Image credit: Madprime
  • 12. <ul><li>Principle of dominance states: </li></ul><ul><li>some alleles are dominant and others are recessive </li></ul><ul><ul><li>If dominant allele present, it will be expressed </li></ul></ul><ul><ul><li>Recessive alleles only expressed if NO dominant allele present </li></ul></ul>
  • 13. Goal 4 Describe what happens to alleles during segregation in meiosis
  • 14. <ul><li>Alleles separate during meiosis </li></ul><ul><li>Alleles segregate into one allele per gamete </li></ul><ul><li>Two types of gametes can be produced </li></ul><ul><li>Alleles pair up randomly when gametes unite during fertilization </li></ul>
  • 15. <ul><li>Example on the board… </li></ul>
  • 16. Goal 5 Use Punnett Squares to: determine genotypic and phenotypic ratios of a cross to Predict outcomes
  • 17. <ul><li>Phenotype = the expressed physical trait </li></ul><ul><ul><li>What can be seen (brown hair) </li></ul></ul><ul><ul><li>Dependent on genotype </li></ul></ul><ul><li>Genotype = the alleles of a genetic code </li></ul><ul><ul><li>Genetic code (one maternal, one paternal) </li></ul></ul><ul><ul><ul><li>Homozygous = alleles are the same (BB or bb) </li></ul></ul></ul><ul><ul><ul><li>Heterozygous = alleles are different (Bb) </li></ul></ul></ul>
  • 18. <ul><li>Recessive phenotype </li></ul><ul><ul><li>Genotype MUST be homozygous recessive </li></ul></ul><ul><ul><li>Genotype bb expresses phenotype blond hair </li></ul></ul><ul><li>Dominant phenotype </li></ul><ul><ul><li>Genotype may be homozygous dominant </li></ul></ul><ul><ul><ul><li>BB expresses brown hair </li></ul></ul></ul><ul><ul><li>Genotype may be heterozygous </li></ul></ul><ul><ul><ul><li>Bb also expresses brown hair </li></ul></ul></ul>
  • 19. <ul><li>Genotypes are used to create Punnett Squares and compare possible combinations of gametes </li></ul><ul><li>Parent 1 gamete possibilities </li></ul><ul><li>Parent 2 gamete possibilities </li></ul>Possible Combination Possible Combination Possible Combination Possible Combination
  • 20. B b b B Parent 1 : homozygous dominant Parent 2 : homozygous recessive Bb Bb Bb Bb
  • 21. B b B b Parent 1 : heterozygous Parent 2 : heterozygous bb Bb BB Bb
  • 22. B b B b Genotypic ratio of offspring 1BB : 2Bb : 1bb Phenotypic ratio of offspring 3 brown hair : 1 blond hair (75% chance) (25% chance) bb Blond hair Bb Brown hair BB Brown hair Bb Brown hair
  • 23. ? ? ? ? Parent 1 : heterozygous (Bb) Parent 2 : homozygous recessive (??) ?? ?? ?? ??
  • 24. B b b b Parent 1 : heterozygous (Bb) Parent 2 : homozygous recessive ( bb ) bb Bb Bb bb
  • 25. B b b b bb Bb Bb bb Genotypic ratio of offspring ?? : ?? Phenotypic ratio of offspring ?? : ??
  • 26. B b b b bb Bb Bb bb Genotypic ratio of offspring 2Bb : 2bb Phenotypic ratio of offspring 2 brown hair : 2 blond hair (50% chance) (50% chance)
  • 27. <ul><li>Thanks to the following people who have generously shared images on Flickr creative commons: </li></ul><ul><li>Unertlkm… pea plant </li></ul><ul><li>Z e n… butterfly and pea bloom </li></ul>

×