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Geneticsreviewforslideshare
1. GENETICS REVIEW
⢠We get our genes from our parents
â Half from our mom & half from our dad
⢠Genes are represented by 2 letters
â This is the genotype
â Each letter can be capital (dominant) or lower
case (recessive)
â Genotypes can be homozygous or heterozygous
â Homozygous â 2 letters are the same
⢠Example: HH or hh
â Heterozygous â the 2 letters are different
⢠Example - Hh
2. GENETICS REVIEW, continued
⢠Phenotype â tells how the genes look
â Example, eye color â blue is recessive (b)
â Brown is dominant (B)
⢠BB is a homozygous genotype --- the
phenotype is BROWN
⢠Bb is a heterozygous genotype --- the
phenotype is BROWN
⢠bb is a homozygous genotype --- the
phenotype is BLUE
3. GENETICS REVIEW, CONTINUED
⢠We can predict the possible traits show with
Punnett Squares
⢠Break the genotypes up, put each letter over
the top or down the side
⢠Then you drag each letter down into each box
What is the B B
chance of a man Zero percent
b
with blue eyes chance. In order
Bb Bb for blue eyes to
and a female
with brown eyes appear you need 2
(homozygote) Bb Bb recessive alleles.
b
having a blue The female on has
eyed child? 2 dominant alleles.