 Farmer Ted has a curly tailed male pig and wants to know whether it is a pure breed or not. He has asked you (the genetics expert) to find out for him…

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Presentation transcript:

 Farmer Ted has a curly tailed male pig and wants to know whether it is a pure breed or not. He has asked you (the genetics expert) to find out for him…  Curly tails (T) are dominant over straight tails (t). Wenerei, 14 Whiringa-ā-nuku 2015

Female Male  Mate the pig in question with a female pig with a straight tail. t T t T Tt Female Male t T t t Tt tt Tt tt

 If the male was a pure breed, then 100% of his offspring would have curly tails.  If there were ANY offspring with straight tails then the male pig would not be a pure breed.

You should now be able to: 1) Explain what is meant by genotype and phenotype 2) Explain what is meant by dominant and recessive 3) Explain what is meant by homozygous and heterozygous 4) Use a Punnett Square to determine genotype and phenotype Today’s learning: 1) Use a Pedigree Chart to (or Inheritance Tree) to determine genotype and phenotype

Homework: Feedback This Week’s Homework: Solutions on the wiki – please mark and correct before handing in - due Tuesday. Test: Next Friday 8 th March

A pedigree chart is a chart which shows the genotypes of parents and their offspring. Looks similar to a family tree. Males are (usually) represented by squares and females by circles.

The chart gives the ear shape in a family of mice. Pointed ears (E) is dominant over round ears (e). MotherFather E ee pointed roundpointedround e E e

 Methemoglobinemia is a blood disorder that restricts the bloods ability to carry oxygen.  The condition, which causes the skin to turn blue/purple, is caused by a recessive gene.

Ann TomRobyn Martin John Mm M ? MM M ? BenjyCarl Mm mm Mm  Determine the missing genotypes. Methemoglobinemia

 Complete the worksheet on Pedigree Charts  Fast finish: Jellyfish Pigs