DNA and Genetics - chapter 4 and 5

• Biologie
• Middelbare school
• vwo
• Leerjaar 3

Inheritance 

DNA & Genetics

Chapter 4 and 5

Planning

- Worksheet check

- Repeat 

T

Allele

Dominant

Genotype

Heterozygote

Homozygote

Recessive

Phenotype

Same gene: different forms

Two of the same genes

The weaker allele

Appearance

Two different alleles

The stronger allele

Genetic constitution: the alleles that you have

1a) Dd x dd

       D     d

d   Dd  dd

d   Dd  dd

50% will have normal hearing

1b) dd x DD

       D     D

d   Dd  Dd

d   Dd  Dd

100% will have normal hearing and will be heterozygous

2) 'Normal' man x albino woman

                 Bb        x  bb

Their child has bb 

      B     b

b   Bb   bb

b   Bb  bb

50% albino 

50% 'normal'

3) B = brown

    b = silverblue 

    P=   BB x bb

F1:  B     B

b   Bb   Bb

b   Bb   Bb

100% Brown heterozygous

4) B = brown

    b = silverblue 

       Bb x bb

 F2:   B     b

    b   BB   Bb

    b   Bb   bb

25% homozygous dominant

50% heterozygous

25% homozygous recessive

Genotypic ratio = 1:2:1

Phenotypic ratio = 3:1

What do squares represent?

1. Female
2. male

What do circles represent?

1. Female
2. male

What do the colored squares represent?

1. Sick
2. Healthy
3. Dead
4. Alive

What does a horizontal line between a circle and square represent?

1. Siblings
2. Married

What does a vertical line represent?

1. Siblings
2. Married
3. Children off

Dominant or Reccesive?

1. Dominant
2. Recessive

How many generations are shown on the pedigree?

1. 1 generation
2. 2 generations
3. 3 generations
4. 4 generations

Which parent in the first generation has sickle cell anemia?

1. Father
2. Mother

How many children were born in the 2nd generation?

1. 2
2. 4
3. 6
4. 8

How many children were born in the 2nd generation?

1. 2
2. 4
3. 6
4. 8

Is the gene for sickle cell anemia likely to be dominant or recessive? Explain your answer

               GET TO WORK

> Make the practice test from 'jaarbijlagen in som'            

What to learn:

Booklet Inheritance: Chapter 1 to 5

(You can also use Unit 5 BS 1 to 3, but this is not necessary.)

Zie jaarbijlagen voor oefeningen, antwoorden en een checklist!