9 dominant and recessive alleles

• Biologie
• Middelbare school
• havo, vwo
• Leerjaar 3

9 dominant and recessive alleles 

Where in your cells can you find chromosomes?

How many chromosomes do you have in each nucleus?

1. 44
2. 46
3. 48
4. 23

How many sex chromosomes do you have in a muscle cell?

1. 0
2. 1
3. 2
4. 46

How many X chromosomes do you have in a skin cell?

1. 0
2. 1
3. 2
4. 46

A cell with an X chromosome and a Y chromosome, can be a

1. muscle cell
2. sperm cell
3. egg cell
4. no cell

The building blocks for proteins are called ...

1. DNA
2. RNA
3. Amino acids
4. Ribosomes

The molecule
shown in the
picture is called ...

1. DNA
2. RNA
3. an amino acid
4. a ribosome

A segment of DNA has the following order of nucleotides : ATTGGCAGTA. What is the order of nucleotides on the other strand?

A segment of DNA that codes for one protein is called a ...

What is an allele?

An allele is a different (specific) form of a gene

Why do you have two alleles for each gene?

Because you have two chromosomes with the same gene (one from mom, one from dad)

Oliver says: 'all humans have the same genes, but not the same alleles'. Charley says: 'all humans have the same alleles, but not the same genes'. Who is right?

1. Oliver
2. Charley
3. They both are
4. They are both wrong

Is it a gene or an allele?

GENE

ALLELE

skin colour

curly hair

flower colour

blue eyes

blood type

type A blood

colour-blindness

hair type

short wings in a fruit fly

NOTE. INHERITANCE (terminology)

Heterozygous = 2 different alleles Aa

Homozygous= 2 same alleles 

Homozygous dominant= 2 dominant alleles AA

Homozygous recessive= 2 recessive alleles aa

Homozygous dominant:

1. RR
2. Rr
3. rr

test on unit 5 BASICS 1 to 9