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Yellow ABA Book. Complete Pg. 87, 89 and 92 Standards being written: 90168 – Microorganisms 90163 – Genetics 90189 – Chemistry 90191 – Physics 90179 – Reproduction. Biology Friday. Nov. 19 am. Science Monday. Nov. 22 am. Human Biology Friday. Nov. 26 am.

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yellow aba book
Yellow ABA Book
  • Complete Pg. 87, 89 and 92
  • Standards being written:
    • 90168 – Microorganisms
    • 90163 – Genetics
    • 90189 – Chemistry
    • 90191 – Physics
    • 90179 – Reproduction

Biology

Friday. Nov. 19 am

Science

Monday. Nov. 22 am

Human Biology

Friday. Nov. 26 am

genetic problem solving1
Genetic Problem Solving
  • Each gamete has one gene for each trait.
  • After fertilization the new organism has two genes for each trait (Genotype).
genetic problem solving2
Genetic Problem Solving
  • If the two alleles in the genotype are the same, then the organism is said to have a homozygous genotype and is pure breeding.
  • If the alleles are different then the organism is heterozygous.
what the
What the ?

Gene

Eye Colour Gene

Homozygous

Heterozygous

Hair Colour Gene

dominant vs recessive
Dominant vs. Recessive
  • Only one allele is expressed in the phenotype.
  • The allele which will always be expressed is called the Dominant allele.
  • The allele which may be hidden is called the Recessive allele.
punnet squares
Punnet Squares
  • Punnet Squares are usedto determine the probability of an offspring having a particular genotype.
  • We can also work out what the expected phenotype will be.
  • It is made by comparing all the possible combinations of alleles from the mother with those from the father.
punnet square practice
Punnet Square Practice
  • If two parents are both heterozygous for the tongue rolling gene, predict what genotype and phenotype their offspring may have.
    • Roller allele is dominant (R)
    • Non-roller allele is recessive (r)
punnet square practice1
Punnet Square Practice

Female

r

R

R

Rr

RR

Male

r

Rr

r r

genotype
Genotype

Phenotype

  • Offspring have a 25% change of being RR
  • 50% chance of being Rr
  • 25% chance of being rr
  • Offspring have a 75% chance of being able to roll their tongues
  • And a 25% chance they can not
genotype vs phenotype
Genotype vs. Phenotype
  • Genotype:The specific alleles an organism possesses for a trait (eg. BB, Bb or bb).
  • Phenotype: The physical trait an organism shows due to their genotype (Brown eyes or Blue eyes).
try this
Try This
  • Ms. Honeypot crossed a heterozygous pea plant and a purebred plant with green peas in an attempt to create yellow peas.

In pea plants, yellow peas are dominant over green peas.Use a Punnett square to predict the phenotypic and genotypic outcome (offspring).

punnet square practice2
Punnet Square Practice

Purebred

y

y

Y

Yy

Yy

Heterozygus

y

yy

yy

try this1
Try This
  • In pea plants, round peas are dominant over wrinkled peas.

Use a Punnett square to predict the phenotypic and genotypic outcome of a cross between a plant homozygous for round peas and a plant homozygous for wrinkled peas.

punnet square practice3
Punnet Square Practice

Wrinkled

r

r

R

Rr

Rr

Round

R

Rr

Rr

punnet square practice4
Punnet Square Practice
  • Complete worksheet “More Punnet Practice”
oink oink try this
Oink Oink! (Try This!)
  • Farmer Ted has a curly tailed male pig and wants to know whether it is pure breeding or not. He has asked you (the genetics expert) to find out for him?
  • Curly tails (T) are dominant

over straight tails (t).

oink answer
Oink (Answer)
  • Mate the pig in question with

a female pig with a straight tail.

Female

Female

t

t

t

t

T

T

Tt

Tt

Tt

Tt

Male

Male

T

t

Tt

Tt

tt

tt

conclusions
Conclusions
  • If the male was pure breeding then 100% of F1 offspring would have curly tails.
  • If there were ANY F1 offspring with straight tails then the male pig would not be pure breeding.
test cross
Test Cross
  • In genetics a test cross is used to determine if an individual exhibiting a dominant trait is homozygous or heterozygous.
  • Test crosses determine the

genotype of an individual.

test cross1
Test Cross
  • Test crosses involve breeding the individual in question with another individual that expresses a recessive version of the same trait.
  • If all offspring display the dominant phenotype, the individual in question is homozygous dominant.
  • If any of the offspring displays a recessive phenotype, then the individual is heterozygous.
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