Your SlideShare is downloading. ×
  • Like
Upcoming SlideShare
Loading in...5

Thanks for flagging this SlideShare!

Oops! An error has occurred.


Now you can save presentations on your phone or tablet

Available for both IPhone and Android

Text the download link to your phone

Standard text messaging rates apply

2nd year

2nd year

  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Be the first to comment
No Downloads


Total Views
On SlideShare
From Embeds
Number of Embeds



Embeds 0

No embeds

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

    No notes for slide


  • 1. Mendel’s Laws ofHeredityWhy we look the waywe look...
  • 2. What is heredity?The passing on ofcharacteristics (traits)from parents to offspringGenetics is the study ofheredity
  • 3. Mendel used peas...They reproduce sexuallyThey have two distinct,male and female, sex cellscalled gametesTheir traits are easy toisolate
  • 4. Mendel crossed themFertilization - the unitingof male and femalegametesCross - combining gametesfrom parents withdifferent traits
  • 5. QuestionsWhat did Mendel cross?What are traits?What are gametes?What is fertilization?What is heredity?What is genetics?
  • 6. What Did Mendel Find?He discovered differentlaws and rules that explainfactors affecting heredity.
  • 7. Rule of Unit FactorsEach organism has twoalleles for each trait – Alleles - different forms of the same gene – Genes - located on chromosomes, they control how an organism develops
  • 8. Rule of DominanceThe trait that is observedin the offspring is thedominant trait (uppercase)The trait that disappearsin the offspring is therecessive trait (lowercase)
  • 9. Law of SegregationThe two alleles for a traitmust separate whengametes are formedA parent randomly passesonly one allele for eachtrait to each offspring
  • 10. Law of IndependentAssortment The genes for different traits are inherited independently of each other.
  • 11. Questions...How many alleles are therefor each trait?What is an allele?How many alleles does aparent pass on to eachoffspring for each trait
  • 12. Questions...What do we call the traitthat is observed?What case (upper or lower)is it written in?What about the one thatdisappears?What case is it written in?
  • 13. Phenotype & GenotypePhenotype - the way anorganism looks – red hair or brown hairgenotype - the genecombination of an organism – AA or Aa or aa
  • 14. Heterozygous & Homozygous Heterozygous - if the two alleles for a trait are different (Aa) Homozygous - if the two alleles for a trait are the same (AA or aa)
  • 15. Dihybrid vs Monohybrid Dihybrid Cross - crossing parents who differ in two traits (AAEE with aaee) Monohybrid Cross - crossing parents who differ in only one trait (AA with aa)
  • 16. Questions...What is the phenotype?What is the genotype?What is homozygous?What is heterozygous?What is monohybridcrossing?