Post on 24-Dec-2015
transcript
Key Vocabulary:
genetics Heredity
Genetic traits vs. acquired characteristics
(nature) vs. (nurture)
(raw talent) (specific skills)
Key VOCAB: (New)
genotype phenotype heterozygous homozygous Law of Dominance dominant Recessive environment
Some human examples read “=“ as “codes for”
B= brown eyes b = blue eyes
D = dimples d = no dimples
F = freckles f = no freckles
M = migraines m = no migraines
G = near-sighted g = normal vision
All BIO 151 Students have three possible genotypes
w respect to eye color:B B
║B b
║b b
║Genotype
Phenotype
All BIO 151 Students have three possible genotypes
w respect to eye color:B B
║B b
║b b
║Genotype Homozygous
Dominant
Phenotype
All BIO 151 Students have three possible genotypes
w respect to eye color:B B
║B b
║b b
║Genotype Homozygous
Dominant
Phenotype Brown eyes
All BIO 151 Students have three possible genotypes
w respect to eye color:B B
║B b
║b b
║Genotype Homozygous
DominantHeterozygous
Phenotype Brown eyes Brown eyes
All BIO 151 Students have three possible genotypes
w respect to eye color:B B
║B b
║b b
║Genotype Homozygous
DominantHeterozygous Homozygous
recessive
Phenotype Brown eyes Brown eyes
All BIO 151 Students have three possible genotypes
w respect to eye color:B B
║B b
║b b
║Genotype Homozygous
DominantHeterozygous Homozygous
recessive
Phenotype Brown eyes Brown eyes Blue eyes
Question:
What does meiosis have to do with genetics??
Remember: Homologs (matching chromosomes) separate into different gametes…….
Problem: Find all possible gametes for individuals w the following genotypes:1) BB 2) Bb
3) BbFF 4) BbMm
5) FfDdmm 6) MM
How do you predict the genotypes of the offsprng of any two individuals?? (What do you do when it’s fourth down & 40?)
Guide for Solving Genetic Problems:1) Record genotypes of both parents
2) Record all possible gametes.(Don’t SKIP this step!!)
3) Construct a Punnet Box
4) ANSWER the question asked!
Practice Problem #1:
Bill is heterozygous for eye color. Jeannie has blue eyes. What is the probability that their daughter has blue eyes?
Practice Problem #2
Fred is homozygous dominant for eye color and heterozygous for dimples. Wilma has blue eyes and no dimples. What is the probability that Pebbles is both blue-eyed & dimpled.(Show all work)