# DNA and Genetics - Chapter 4

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Slide 1: Tekstslide
BiologieMiddelbare schoolvwoLeerjaar 3

In deze les zitten 10 slides, met interactieve quizzen en tekstslides.

Lesduur is: 45 min

## Onderdelen in deze les

#### Slide 2 -Tekstslide

Monohybrid cross
Monohybrid cross = cross where you look at only one trait

The flowers cross. That means they are the parents, which we call the P-generation.

Both flowers are homozygous. White is recessive What are their genotypes?
And what is the genotype and the phenotype of the offspring?

#### Slide 3 -Tekstslide

Monohybrid cross
Monohybrid cross = cross where you look at only one trait

The flowers cross. That means they are the parents, which we call the P-generation.

Both flowers are homozygous. White is recessive What are their genotypes?
Red flower = BB         White flower = bb
And what is the genotype and phenotype of the offspring?
Genotype = Bb         Phenotype = red

#### Slide 4 -Tekstslide

Monohybrid cross
The F1 generation is the offspring for the P-generation.
The F2-generation is the offspring of the F1-generation.

Now, the F1 flowers will cross. Make a Punnett-square of this cross. What percentage of the F2 will be white?

25% will be white
A
a
A
AA
Aa
a
Aa
aa

#### Slide 5 -Tekstslide

Monohybrid cross
The F1 generation is the offspring for the P-generation.
The F2-generation is the offspring of the F1-generation.

Now, the F1 flowers will cross. Make a Punnett-square of this cross. What percentage of the F2 will be white?

#### Slide 6 -Tekstslide

Black fur(B) in guinea pigs is dominant over white fur(b). Find the probability of heterozygous offspring in the cross: BB x Bb.

#### Slide 7 -Open vraag

Black fur(B) in guinea pigs is dominant over white fur(b). Find the probability of a white offspring in a cross: Bb x bb

#### Slide 8 -Open vraag

A woman with blue eyes has a child with brown eyes. The allele for B brown eyes is dominant over the allele for blue eyes. What genotype(s) could the father have had?

#### Slide 9 -Open vraag

In cats, the gene for a spotted coat (R) is dominant over that for an unspotted coat (r). A female with spotted fur gives birth to a male with spotted fur. Among the young are animals with a spotted coat and animals with an unspotted coat. What are the genotypes of the parent animals?