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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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