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12.1 Passing on characteristics
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Slide 1:
Tekstslide
Biologie
Middelbare school
havo
Leerjaar 3
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Lesduur is:
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Slide 1 - Tekstslide
12.1 Passing on characteristics
Slide 2 - Tekstslide
Learning objective
You will learn where you get your characteristics from and how you can pass them on.
There are a lot of videos in the shared version of this LessonUp.
Genotype/Phenotype, Alleles and Genes, Homozygous/Heterozygous, Dominant/Recessive alleles
Slide 3 - Tekstslide
Slide 4 - Video
Where Duke's blue eyes come from
Slide 5 - Tekstslide
Slide 6 - Video
Passing on characteristics
-Gene
have several variants.
e.g. 1 allele for brown, 1 allele for blue.
The genotype always contains two
alleles
per trait (one from mother and one from father).
Slide 7 - Tekstslide
Homozygous and heterozygous.
Homozygous:
if two alleles for the trait are the same
(for example for eye color: both blue)
Heterozygous:
if the two alleles are different (e.g. blue/brown)
Slide 8 - Tekstslide
Slide 9 - Video
Passing on alleles
Slide 10 - Tekstslide
Dominant and recessive
Dominant:
The stronger allele for a characteristic.
Recessive =
the suppressed allele for a characteristic.
Slide 11 - Tekstslide
Slide 12 - Video
Where Duke's blue eyes come from
Slide 13 - Tekstslide
Slide 14 - Video
Denoting genotypes
*Dominant alleles
are indicated with a capital letter
*Recessive alleles
are indicated with a lower case letter.
Tip: Always choose a letter where the capital letter does not resemble the small letter.
Slide 15 - Tekstslide
Hoe noteer je genotypen?
2 alleles for each trait.
Therefore: a genotype 'code' consists of 2 letters.
*BB
means homozygous dominant
*Bb
means heterozygous
*bb
means homozygous recessive
Slide 16 - Tekstslide
Hoe zien de nakomelingen eruit?
Based on the genotype of parents, you can make a prediction about the genotype of the offspring.
(Crossing
= two parents producing offspring together)
Slide 17 - Tekstslide
Hoe maak ik een kruisingsschema?
Slide 18 - Tekstslide
What?
Read: 12.1
Make: assignments 2, 4-8, 10, 13-17
How?
In your book. Choose: whispering
or
listening to music on your laptop.
Help?
Raise your hand. If he/she is not listening to music, you may ask your neighbour first.
Time?
10 minutes
Finished?
Read: how does DNA determine your hereditary characteristics? Make 25 and 27
Proceeds
You have finished your homework! Well done!
Slide 19 - Tekstslide
You will learn where you get your characteristics from and how you can pass them on.
Slide 20 - Tekstslide
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