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5.6 the difference of being a boy or girl
5.6 the difference of being a boy or girl
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Slide 1:
Diapositive
Biologie
Middelbare school
vwo
Leerjaar 3
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5.6 the difference of being a boy or girl
Slide 1 - Diapositive
what is:
1. an allele
2. dominant allele
3. recessive allele
Slide 2 - Question ouverte
male and female
male: 2x 22 autosomes + X + Y = 46 chromosomes
female: 2x 22 autosomes + X + X = 46 chromosomes
Slide 3 - Diapositive
egg cell and sperm cell
egg cell contains 22 autosomes + X chromsome
sperm cell contains 22 autosomes + X
or
22 autosomes + Y
Slide 4 - Diapositive
today''s program
learning objectives: you're able to answer the following questions
why do certain inherited diseases occur more often in boys than in girls?
given a certain combination of parents, how can you determine the genotype and phenotype of sex-linked inherited characteristics in the offspring?
Slide 5 - Diapositive
Slide 6 - Vidéo
recap - sex linked traits
female: XX, male: XY
traits are only on the X chromosome
On the Y is just all the genes for becoming a man
Genotypes are written down like this (when they are sex linked!) X
H
X
h
or X
h
X
h
Slide 7 - Diapositive
calculating chances
1. write down both genotypes XX and XY with the trait XHXH and XhY for example
2. Use a punnet square!
3. Calculate the chance of every possible phenotype and answer the question
Slide 8 - Diapositive
LET'S PRACTISE TOGETHER
A mother who is a carrier for colour-blindness gets a child with a father who has normal vision.
What are the probabilities of their children being colour-blind? Use a Punnet square!
colour-blindness is sex-linked!
Slide 9 - Diapositive
start homework!
study 5.6
do excercise 37, 38, 40, 41, 42, 43, 44, 45
Slide 10 - Diapositive
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