TTO3 Punnet squares 5.4

• Biologie / Verzorging
• Middelbare school
• vwo
• Leerjaar 3

How many genes do humans have?

1. 25.000
2. 50.000
3. 100.000
4. 1.000.000

Two pupils each make a statement:
- Olivier says that all humans have the same genes, but not the same alleles.
- Charissa says that all humans have the same alleles but not the same genes.

Which pupil is correct?

1. None
2. Oliver
3. Charissa
4. Both

Gene

Allele

Skin colour

Blood type

Blue eyes

Flower colour

Curly hair

Type A blood

Hair type

Short wings in a fruit fly

How many alleses do you have per gene in and egg cell?

Two parents who are heterozygous for the eyecolour have children. What is the chance that their firstborn has brown eyes as well?

1. 0%
2. 25%
3. 50%
4. 75%

A fruit fly with normal wings mates with a fruit fly with curly wings. The F1 all have normal wings. What are the genotypes of the parents?

1. BB x bb
2. Bb x Bb
3. BB x Bb
4. Bb x bb

The F1 mates together to produce the F2. What is the chance the F2 have curly wings?

1. 0%
2. 25%
3. 50%
4. 75%

In humans, red hair (r) is recessive to dark hair. Two dark-haired parents have a red-haired child.
What are the genotypes of the parents?

1. Aa x Aa
2. AA x Aa
3. AA x aa
4. AA x aa

A peaplant with yellow peas is crossed with a peaplant with green peas. They produce a F1. Half of the offspring has yellow peas the other half green peas. What is the genotype of the parents?

1. Bb and Bb
2. BB and bb
3. Bb and bb
4. BB and Bb

A white rabbit mates with a black rabbit. All of their offspring is grey. What is the genotype of the offspring

1. WW
2. WB
3. Bb
4. BB

Two of those grey rabbits mate and have a F2 offspring. What is the chance the F2 has a heterozygous genotype?

1. 0%
2. 50%
3. 75%
4. 100%

Punnet Squares

Dominant/recessive
Incomplete dominance

Blood groups

Lethal factor

Autosomal or sex-linked

Dihybrid cross