Download - Punnett Squares And Meiosis!
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Punnett SquaresAnd Meiosis!
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Meiosis:A type of cell division in which a diploid cell(two copies of each gene) divides to form a haploid cell (one copy of each gene). = SPERM and EGG!
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Dominant T - curved thumb/allele Recessive t - not curvedallele
Dominant T - curved thumballele
Recessive t - not curvedallele
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Tt
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Tt
T
tT
t
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Punnett Square: A method to determine the likely genotypes and phenotypes of offspring
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T
t
T
teggs
sperm
ttTt
TtTTCurved thumb
Straight thumbCurved thumb
Curved thumb
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How to fill in a punnett square
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Using the Punnett Square below, correctlycross a heterozygous brown haired person with a homozygous blonde haired person.
Bb x bb
B = brown hair alleleb = blonde hair allele
B
b
b
b
bbBb
Bb bb
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b b
B
b
Bb Bb
bb bb
Phenotype: 2 brown hair and 2 blonde hairGenotype: 2 Bb and 2 bb
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Solve the following problems:GIVE THE PHENOTYPE & GENOTYPE!
Cross EE x ee (brown eyed person with blue eyed)
Cross a wrinkled seed with a homozygous round seed (W = wrinkled w = round)
Cross a heterozygous tall person with a heterozygous tall person.
Cross a homozygous tall person with a short person
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Mendel’s Laws
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Law of Segregation
Two alleles separate from each other during meiosis!
Each homologous chromosome pair separates during the formation of the sperm and egg (meiosis!)
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Law of Segregation
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Law of segregation
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Incomplete Dominance Hh (heterozygote)
where the functioning allele makes less protein
Example: in snapdragon flowers, red is dominant, but less protein pigment is made w/ Rr; the flower is pink (Rr) = pink
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Incomplete Dominance Practice
In the budgerigars bird (“budgie”), olive feather color is dominant (GG), dark green is heterozygous (Gg), and light green is recessive (gg).
Cross an olive bird and a light green bird.
Cross two heterozygous birds
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Codominance When both alleles
(forms of a gene) are expressed
Blood type is an example of codominance
Blood type A is codominant with B
Blood type O is recessive to A and B
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Codominance Practice Cross a person with
type O blood (oo) with a person who has type A blood (Ao).
What are the possible genotypes and phenotypes of their children?
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G: 2 Ao: 2 oo P: 2: type A blood : 2 type o blood
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Sex-Lined Traits gene carried only
on the X chromosome
there is no corresponding gene on the y chromosome
Cross a non-colorblind male (XBY) with a “carrier” female (XBXb)
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Law of Independent Assortment
The distribution of alleles for one trait does not affect the distribution for of alleles for other traits
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Law of Independent Assortment
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Law of Independent Assortment
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Law of Independent Assortment