Download 10N Y17 M03 D29

10N 29 Poutū-te-Rangi 2017
What we will do
What we will learn
Quick quiz and preliminaries
Revisit genetics intro: dominant,
recessive, allele, heterozygous,
homozygous, punnett square
AND introduce genotype and
phenotype
How to start well
Useful definitions for the
buzzwords in this topic
See why Cystic Fibrosis happens
and what being a “carrier” means
Use Punnett squares to compare
CF scenarios.
How genetic diseases affect
humans
How being a “carrier” can be
passed along
If time, do a Punnett square on
Jimmy and Jeannie
How Punnett squares works
with dog breeding
10N – Seating Plan
Front of lab - Whiteboard
HW item
Skills practiced
HW booklet pages on skeletal
system, muscles and joints, blood
and heart, circulatory system
Pages 1 - 8
Due Thursday 2nd of March 2017
Time management
Knowledge of three systems in
the body
HW booklet pages 9 – 18:
circulatory, breathing and
digestive systems.
Due Monday 20th of March 2017
Time management
Knowledge of three systems in
the body
HW booklet pages 19, 27, 28, 29
Human Reproduction
Due Zenday 37th of Octember
Human Reproduction
Word
Meaning
Dominant
An allele which controls what an organism looks like. (The more
powerful message of the two possible)
Recessive
Only shows up when there are two of these. (The weaker of the two
possible – so it shows up when the other one is missing)
Homozygous
Containing two identical forms of the same gene. (Both dominant or
both recessive)
Heterozygous
An individual containing two different forms of the gene.
Allele
Different forms of a gene.
Genotype
The genetic make-up of an individual. The “type-o’-gene”. i.e. is it
heterozygous, homozygous dominant or homozygous recessive?
Phenotype
The physical characteristics of an individual. “Phenotype” is “the TYPE
of PHENOmenon”. i.e. – what shows up.
For this breed of
dog, long hair (H)
is dominant of
short hair (h)
After mating,
Jeanny produces
six pups
Jimmy (hh – short hair)
Jeanny (HH – long hair)
1. Draw up a Punnett square to predict the hair length of the pups.
For this breed of
dog, long hair (H)
is dominant of
short hair (h)
After mating,
Jeanny produces
six pups
Jimmy (hh – short hair)
Jeanny (HH – long hair)
1. Draw up a Punnett square to predict the hair length of the pups.
2. Write down what the phenotype and the genotype are for the pups
Cystic Fibrosis
This is a genetic disease that is passed on when a baby gets TWO
copies of the recessive gene. It is normally fatal, with few living
past their 30s.
If we use:
F = healthy
f = cystic fibrosis then:
FF = homozygous dominant. Does not have CF & cannot pass it on
Ff = heterozygous. Does not have CF but CAN pass it on
fF = heterozygous. Does not have CF but CAN pass it on
ff = homozygous recessive. DOES have CF and CAN pass it on too.
heterozygous people are called “carriers”
A Mum is healthy and NOT a carrier. Blood tests have figured this out. She marries a man
who has CF and they decide to have kids.
What are the chances a baby will have CF?
What are the chances a baby will be healthy but a carrier?
What are the chances a baby will be healthy but not be a carrier?
Use a Punnett square to figure out the answers.