Biology Law of Heredity Ms. Yang 02.07.2013. Objectives SWBAT… 1.Set up and solve a Punnett square 2.Review key concepts of heredity. Catalyst Turn the

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  • Slide 1
  • Biology Law of Heredity Ms. Yang 02.07.2013
  • Slide 2
  • Objectives SWBAT 1.Set up and solve a Punnett square 2.Review key concepts of heredity. Catalyst Turn the following into a ratio: 1.6 white eyes to 7 red eyes 2.9 pink to 8 purple to 6 blue 3.10 oranges to 10 apples to 10 bananas Date: 02/06/2013
  • Slide 3
  • Catalyst Response 1.6 white eyes to 7 red eyes 2.9 pink to 8 purple to 6 blue 3.10 oranges to 10 apples to 3 bananas to 3 grapes to 10 peaches 6:7 9:8:6 10:10:3:3:10
  • Slide 4
  • Group Roles RoleDuties Manager* Reads directions and keeps group on task Recorder* Turns in worksheet and makes sure everyone agrees on answers Reporter* Presents answers to class Technician* Gets materials and asks questions to teacher or other groups. It is EVERYONEs duty to contribute to the group and learn the material!
  • Slide 5
  • Model 3 Send TECHNICIAN to get penny. Complete Model 3.
  • Slide 6
  • Model 3 RR rr Rr Rr Possible combination of alleles: Rr Phenotype: round Possible combination of alleles: RR, Rr, rr Phenotype: round, round, wrinkled
  • Slide 7
  • Model 4
  • Slide 8
  • Mendels Law of Heredity Review Notes!
  • Slide 9
  • Crossed pea plants Tested for different traits Mendels Pea Experiments
  • Slide 10
  • Why pea plants? Easy to grow Dont take up a lot of space Grows fast Easy to mate together Makes lots of offspring (seeds)
  • Slide 11
  • Mendels Pea Experiments Parents First generation, Offspring of Parents Second generation, Offspring of F1 mating with another F1
  • Slide 12
  • Mendels Conclusions Heredity = traits are transmitted from 2 parents to their offspring Trait = a characteristic that is based on genetics Hybrid = offspring of parents that have different forms of a trait Purebred = offspring of parents have the same form of a trait
  • Slide 13
  • Genetics Offspring get two copies of genes for a trait ( ONE FROM MOM, ONE FROM DAD ), sometimes one copy dominates over the other copy.
  • Slide 14
  • Genetics Gene = section of chromosome that tells cell what to do Allele = a variant of a gene Dominant = an allele that dominates over the recessive allele, only need one copy to be expressed Recessive = an allele that gets masked if a dominant allele is paired with it, must have two copies to be expressed
  • Slide 15
  • Genetics Homozygous = 2 identical alleles for a trait Heterozygous = 2 different alleles for a trait Genotype = combination of alleles Phenotype = expression of the genotype, the way the genotype is expressed
  • Slide 16
  • Monohybrid Cross Making a cross for ONE trait A Punnett square for a MONOHYBRID CROSS looks like:
  • Slide 17
  • Steps to solve Punnett Square Cross 1.What are the parent alleles? 2.What size Punnett square? 3.Where do the parent gametes go?
  • Slide 18
  • Example #1 In pea plants. Tall (T) is dominant over short (t) Make a cross between Homo tall X Homo short TTtt
  • Slide 19
  • GENOTYPE _____ PHENOTYPE _______ _____ of the offspring ____ % ___/4 will be _______ TT t t T tT tT t T tT t T tT t TALL ALL 100 4 TALL
  • Slide 20
  • _____ of the offspring ___/4 or ____ % will be _________ GENOTYPES _______ PHENOTYPES _______________ WHAT ARE THE POSSIBLE Tt 4 100 4 tall Tall
  • Slide 21
  • Example #1 In humans. Brown eyes (B) is dominant over blue eyes (b) Make a cross between Hetero X Hetero Bb
  • Slide 22
  • Try the Cross! Bb B b B BB BB b B bB b b bb b
  • Slide 23
  • _____ of the offspring ___/4 or ____ % will have _________ GENOTYPES _______ PHENOTYPES _______________ _______ _______________ WHAT ARE THE POSSIBLE _____ of the offspring ___/4 or ____ % will have _________ Bb BB 25375 1 3 brown eyes 1 blue eyes bb Blue eyes Brown eyes