Genetics - Punnet squares 2

• Biologie
• Middelbare school
• havo, vwo
• Leerjaar 2

Genetics

Pedigrees

How many chromosomes are in a human body cell?

1. 23
2. 46
3. 57
4. 92

Which chromosomes are inherited from the father?

1. Chromosome pair 1 - 11
2. Chromosome pair 12 - 22
3. One of each chromosome pair
4. None

Is this the karyotype of a male or female?

1. Male
2. Female
3. You cannot see that

When you change the colour of your hair you change your?

1. Phenotype
2. Genotype

Gene

Allele

Skin colour

Blood type

Blue eyes

Flower colour

Curly hair

Type A blood

Hair type

Short wings in a fruit fly

Punnet squares

Use scrap paper or a mini white board

Rex, the father is heterozygous. Flora, the mom has blue eyes.

Is this punnet square correct?
brown = A = dominant
blue = a = recessive

1. Correct
2. Incorrect
3. No clue

Two parents who are heterozygous
(B=brown, b=blue)) for 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 (B) mates with a fruit fly with curly wings (b). The offspring 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

In humans, red hair (a) 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

Something new

Working with pedigrees

pedigrees

Healthy male

Healthy female

Male/female with genetic abnormality

Is this condition dominant or recessive?

1. dominant
2. recessive

True or false:

Person 2 is heterozygous

1. true
2. false

True or false:

The genotype of person 5 can not be determined with absolute certainty.

1. true
2. false

True or false:

The chance of person 8 being heterozygous is 25%

1. true
2. false

True or false:

Person 7 must be heterozygous

1. true
2. false

More practice

Somtoday - jaarbijlagen - Pedigree exercises