12.1 Passing on characteristics

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BiologieMiddelbare schoolhavoLeerjaar 3

This lesson contains 20 slides, with text slides and 5 videos.

time-iconLesson duration is: 40 min

Items in this lesson

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12.1 Passing on characteristics

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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

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Slide 4 - Video

Where Duke's blue eyes come from

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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). 

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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)

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Slide 9 - Video

Passing on alleles

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Dominant and recessive
Dominant: The stronger allele for a characteristic.

Recessive = the suppressed allele for a characteristic.

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Slide 12 - Video

Where Duke's blue eyes come from

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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.

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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

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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)

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Hoe maak ik een kruisingsschema?

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Read: 12.1
Make: assignments 2, 4-8, 10, 13-17
In your book. Choose: whispering or listening to music on your laptop. 
Raise your hand. If he/she is not listening to music, you may ask your neighbour first. 
10 minutes
Read: how does DNA determine your hereditary characteristics? Make 25 and 27
You have finished your homework! Well done!

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  • You will learn where you get your characteristics from and how you can pass them on.

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