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					 Simply    Completely
                        Fertilization   Pedigree   Extra Credit
Dominant   Incomplete



  100        100            100          100          100

  200        200           200           200          200

  300        300           300           300          300

  400        400           400           400          400

  500        500           500           500          500
What does heterozygous mean?
    What is an example?
Two different alleles
  Example – Bb
What does Homozygous
Recessive mean? Give an
        example.
Two alleles that are exactly the same
           and recessive
           Example - bb
What is a genotype?
 Genetic makeup of an organism
Alleles are represented as BB, Bb,
                bb
A man with a cleft chin Dd marries a
 woman without a cleft chin dd and
have a child. What are the possible
 genotypes and phenotypes for their
             offspring?
• Genotype                    D     d
  – DD – 0%
  – Dd – 50%
                              Dd   dd
  – dd- 50%               d
• Phenotype
  – Cleft chin- 50%
  – Non cleft chin- 50%       Dd   dd
                          d
• Having free earlobes is dominant.
  Complete a Punnett Square and
  probability of each genotype and
  phenotype if one parent’s genotype
  Homozygous dominant and one
  parent’s genotype is Heterozygous.
• Genotype
  – FF – 50%
  – Ff- 50%
  – ff- 0%
                                F    F
• Phenotype                     FF   FF
  – Free earlobes- 100%     F
  – Attached earlobes- 0%

                                Ff   Ff
                            f
 What is the difference between
simple dominance and complete
          dominance?
  In simple dominance, one allele is
    dominant while the other was
recessive. In incomplete dominance,
     neither allele is dominant nor
      recessive, the heterozygous
    phenotype is a blending of the
       homozygous phenotypes.
 Sponge Bob loves growing flowers
   for his pal Sandy! Her favorite
 flowers, Poofkins, are found in red,
blue, and purple. Write the genotype
 for each color if R represents a red
 gene and B represents a Blue gene.
Red= RR, Blue = BB, Purple= BR
What would happen if Bob crossed a
 red Poofkin with a blue Poofkin.
   Give the phenotypes for the
            offspring.
All of the Poofkins would be purple.
SpongeBob and his pal Patrick love
to go jellyfishing at Jellyfish Fields!
The fields are home to a special type
of green jellyfish known as Goobers
and only really great jellyfishermen
 are lucky enough to catch some on
every trip. Many of the jellyfish are
   yellow (YY) or ?blue (BB), but
      some end up green. Why?
Because of incomplete dominance.
   What would happen if they
  crossed a yellow jellyfish (YY)
   with a goober (BY)? Show a
Punnett square, the genotypes and
           phenotypes.
                   .
                           B     Y
• Genotype                 BY   YY
  – BB- 0%             Y
  – YY- 50%
  – BY- 50%
• Phenotype
                           BY   YY
  – Blue- 0%           Y
  – Yellow – 50%
  – Green – 50%
What are the chromosomes that
make a person a boy or a girl?
XX= girl
XY= boy
How many chromosomes do
people have in all body cells?
46
    What is the female sex
chromosome, sex cell, and how
 many chromosomes are in the
       female sex cell?
The female sex chromosome is X,
the female sex cell is an egg, there
  are 23 chromosomes in the egg.
What is the male sex chromosome,
     sex cell, and how many
chromosomes are in the male sex
                cell?
The male sex chromosome is Y, the
male sex cell is a sperm, there are 23
   chromosomes in each sperm.
 Are men and women able to
produce sex cells their entire
lives after puberty? Explain.
Men can produce sperm their entire
lives starting at puberty however,
 women are born with all the eggs
     that they will ever have.
What is a pedigree?
A pedigree is a chart or family tree
 that tracks which members of a
family that have a particular trait.
In a pedigree how is a female
 represented? How is a male
        represented?
Females are circles, Males are
          squares.
What does it mean when a circle or
      square is shaded in?
It indicates that the person has the trait.
What does the horizontal line on a
 pedigree connecting two shapes
             mean?
The horizontal line represents a
          marriage.
• The pedigree shows
  Huntington’s disease
  which is dominant.
  What are the
  genotypes and
  phenotypes of the
  offspring?
Hh- huntington’s or hh- no
      Huntington’s.
Blood type is a co-dominant trait. If
 the mother’s blood type is AB and
  the fathers blood type is B (Bo),
   what is the probability of each
     genotype and phenotype?
• Genotype
  –   AB- 25%
  –   BB- 25%           A    B
  –   Ao – 25%
  –   Bo – 25%
                        AB   BB
• Phenotype         B
  – Type AB – 25%
  – Type B- 50%         Ao   Bo
  – Type A- 25%     o
     If a trait is sex linked like
colorblindness, why is a male child
   more likely to have the trait?
If the trait is connected to the X
 the boy only has one X so they
have fewer opportunities to get a
    dominant allele to mask a
         recessive allele.
   Color Blindness is a sex linked
 recessive disorder. If a mother is a
 carrier XBXb and the father is color
blind XbY, what is the probability of
   each genotype and phenotype?
• Genotype                         XB      Xb
  – XBXb= 25%                      XBXb   XbXb
  – XbXb= 25%                 Xb
  – XBY = 25%
  – XbY
                                   XBY    XbY
• Phenotype
  – Normal vision carrier –   Y
    25%
  – Normal vision – 25%
  – Colorblind- 50%
 If a mother has medium brown hair
 (AaBb) and a father has blonde hair
(aabb) what would the probability of
the offspring be? Show the first two
        Punnett squares only.
                  A     a
    b    b        AB   aB
    ab   ab   B
a
                  Ab   ab
    ab   ab   b
a
 If a mother has medium brown hair
 (AaBb) and a father has blonde hair
(aabb) what would the probability of
  the offspring be? Show the entire
           Punnett Square
     AB      aB    Ab      ab
     AaBb   aaBb   Aabb   aabb
ab
     AaBb   aaBb   Aabb   aabb
ab
     AaBb   aaBb   Aabb   aabb
ab
     AaBb   aaBb   Aabb   aabb
ab

				
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posted:10/2/2012
language:Latin
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