5.4 Inheritance

5.4 inheritence
1 / 13
suivant
Slide 1: Diapositive
BiologieMiddelbare schoolvwoLeerjaar 2

Cette leçon contient 13 diapositives, avec quiz interactifs et diapositives de texte.

time-iconLa durée de la leçon est: 45 min

Éléments de cette leçon

5.4 inheritence

Slide 1 - Diapositive

alleles: varieties of one gene
on each chromosome you
have an allele of a gene.
For example eye colour:
blue allele or brown allele

Slide 2 - Diapositive

Slide 3 - Diapositive

Is it a gene or an allele?
GENE
ALLELE
skin colour
curly hair
flower colour
blue eyes
blood type
type A blood
colour-blindness
hair type
short wings in a fruit fly

Slide 4 - Question de remorquage

Oliver says: 'all humans have the same genes, but not the same alleles'. Charley says: 'all humans have the same alleles, but not the same genes'.
Who is right?
A
Oliver
B
Charley
C
They both are
D
They are both wrong

Slide 5 - Quiz

dominant and recessive
genotype is written down in letters.
for example
brown eye color A
blue eye color  a
genotype Aa    fenotype = brown eyes

Slide 6 - Diapositive

Slide 7 - Diapositive

dominant, recessive alleles
dominant A    'wins'
recessive a 'looses'
possible genotypes
AA  => homozygous dominant  => brown eyes (fenotype)
Aa => heterozygous => brown eyes (fenotype)
aa => homozygous recessive => blue eyes (fenotype)

Slide 8 - Diapositive

mendelian inheritence
we can calculate probable percentages of offspring with different genotypes/fenotypes
we use a Punnet square

Slide 9 - Diapositive

https://scienceprimer.com/punnett-square-calculator

Slide 10 - Diapositive

Slide 11 - Diapositive

Some fruit flies have curly wings instead of normal wings (see the pictures below). Answer the questions using the letter R for normal wings and r for curly wings:

normal wings                 curly wings
a. Which is the dominant allele? Give the letter and the characteristic.
b. Which is the recessive allele? Give the letter and the characteristic.
c. What is the genotype of a fruit fly that is homozygous for curly wings? 
d. Which two genotypes will result in the ‘normal wings’ phenotype?
e. Can a fruit fly with curly wings have a heterozygous genotype? Explain your thinking.





Slide 12 - Diapositive

CALCULATE THE CHANCE. 
Check out the steps on page 136.  

Let's practice! A guinea pig is homozygous for blue fur. This guinea pig mates with a guinea pig with yellow fur. Use a punnet square to determine the probability of one of their offspring having blue fur.

Slide 13 - Diapositive