Genetics & Inheritance

Chapter 1
Traits in pairs
1 / 31
volgende
Slide 1: Tekstslide
BiologieMiddelbare schoolvwoLeerjaar 3

In deze les zitten 31 slides, met interactieve quizzen en tekstslides.

Onderdelen in deze les

Chapter 1
Traits in pairs

Slide 1 - Tekstslide

Name one trait (=eigenschap) that you inherited (=geërfd) from one of your parents

Slide 2 - Open vraag

Which of the following is a trait(s) of a human?

Sharp fingernails
Yes
No

Slide 3 - Poll

Which of the following is a trait(s) of a human?

Scaly skin
Yes
No

Slide 4 - Poll

Which of the following is a trait(s) of a human?

Short toes
Yes
No

Slide 5 - Poll

Why is it important to talk about traits and inheritance?

Slide 6 - Woordweb

Case study

Slide 7 - Tekstslide

After this lesson...
...you can describe how traits are passed on from parents to children 

Slide 8 - Tekstslide

Answers questions alleles
1. An alternative version of a specific gene
2. eye colour gene, yellow and red alleles
3. No, sometimes there are multiple alleles for one gene
4. In this case yes, but most of the time it isn't the case
5. 2
6. No, alleles can be different for both chromosomes
7. The allele with advantage can take over - fixation

Slide 9 - Tekstslide

Traits
Many traits are passed on from parents to children

But how does that happen?


Slide 10 - Tekstslide

Slide 11 - Tekstslide

Phenotype 
Visible traits --> phenotype

Phenotype results from information in cells

Where in cells do you find information?

Slide 12 - Tekstslide

DNA
Stands for: Deoxyribonucleic acid

A, T, C, G (nucleotides)

Bundled up in structures called chromosomes

Slide 13 - Tekstslide

Chromosomes
23 chromosome pairs in humans 
1 chromosome from mother, 1 from father 

22 pairs autosomes (numbered), 

1 pair sex chromosomes
XX --> female
XY --> Male

How many chromosomes are in sex cells?

Slide 14 - Tekstslide

Genotype & Fenotype
Genes on DNA --> genotype

Expression of gene --> fenotype

Fenotype can also be changed by environment

Slide 15 - Tekstslide

Make assignment chromosomes and genes
4, 5, 6
timer
5:00

Slide 16 - Tekstslide

Genes
Not always active
- Growth
- Lactose intolerance

Variants of a trait --> allele
- Brown/blue eyes
- Straight/curly hair

Slide 17 - Tekstslide

Make assignments Chapter 1
On Somtoday

Slide 18 - Tekstslide

What is genotype?

Slide 19 - Open vraag

What is fenotype?

Slide 20 - Open vraag

When you are male, you have ... as sex chromosomes
A
XX
B
XY

Slide 21 - Quizvraag

A person with Down's syndrome has ...
A
An extra chromosome 21
B
An extra sex chromosome
C
One sex chromosome short
D
One chromosome 21 short

Slide 22 - Quizvraag

What if you have an extra sex chromosome?
A
It's lethal, you cannot live with that
B
Nothing has changed
C
You are definitely female
D
You are intersexual

Slide 23 - Quizvraag

Chapter 2
Reproduction

Slide 24 - Tekstslide

After this lesson
You can describe different types of reproduction and explain the differences between them

Slide 25 - Tekstslide

Asexual reproduction

Slide 26 - Tekstslide

Asexual reproduction

Slide 27 - Tekstslide

Sexual reproduction

Slide 28 - Tekstslide

Sexual reproduction
n = number of chromosomes
Body cells are always 2n!

Formation of sex cells (meiosis):
2n (diploid) --> n (haploid)

When gametes (sex cells) fuse:
n (sperm) + n (egg) --> 2n (zygote)

Slide 29 - Tekstslide

Twins
Non-Identical

Slide 30 - Tekstslide

Make assignments chapter 2

Slide 31 - Tekstslide