1 markThe Human Genome Project set out to sequence the entire human genome.
Which of the following statements, about the genome, is incorrect?
Each person has their own unique genome
Individuals posses one allele for each gene in their genome
The genome is made up all of the genetic material of an organism
DNA in the genome provides the instructions for all of the required proteins of the organism
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1 markWhat is meant by the term 'haploid'?
A nucleus containing two sets of chromosomes
A nucleus containing a single set of chromosomes
A person with only one X chromosome
A person with XXY chromosomes
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1 markNew cells are formed by cell division of existing cells. The diagram below shows four different cells.
Which one is formed by meiotic cell division (meiosis)?
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1 markAlbinism is a condition where the pigment melanin does not get produced in the skin, hair and eyes. This is an inherited condition that is caused by a recessive allele.
If both parents have albinism, what are the chances of the offspring inheriting albinism?
0 %
50 %
75 %
100 %
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1 markA homozygous dominant individual with genotype TT is crossed with a heterozygous individual in a monohybrid cross.
What will the genotypes of the offspring be?
All Tt
50% TT and 50% Tt
50% TT and 50% tt
25% TT, 50% Tt and 25% tt
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1 markA mouse has a diploid chromosome number of 40.
Which row in the table shows the correct number of chromosomes in each cell?
| Number of chromosomes in | ||
| a mouse egg cell | a mouse eye cell | |
| A | 40 | 40 |
| B | 20 | 20 |
| C | 20 | 40 |
| D | 40 | 20 |
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1 markWhich of these processes can produce a new allele?
A change in the environment
Asexual reproduction
Mutation
Selective breeding
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1 markWhy is the process of meiosis important in making gametes?
The cells produced are diploid.
The cells produced are genetically identical.
The cells produced are much smaller in size.
The cells produced have half the number of chromosomes.
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1 markWhat is a genome?
A description of the number of chromosomes in an organism.
All the proteins that one organism can produce.
A store of seeds to preserve genetic variation.
The entire genetic material of an organism.
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1 markA harmful protein can cause pain in the joints. A new treatment is being developed to stop the protein causing pain.
What effect would this treatment have on the person’s phenotype and genotype?
Changes both the phenotype and genotype
Changes the genotype only
Changes the phenotype only
No change to their phenotype or genotype
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1 markThe DNA of an unborn baby can be found in the blood sample of the mother.
This DNA is tested to see which chromosomes are present.
Which conclusion is correct for the unborn baby?
It must be a boy if an X chromosome is present.
It must be a boy if a Y chromosome is present.
It must be a girl if an X chromosome is present.
It must be a girl if a Y chromosome is present.
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1 markWhich combination of gametes will produce a male baby?
A sperm with XY chromosomes and an egg with XX chromosomes.
A sperm with one X chromosome and an egg with one Y chromosome.
A sperm with one Y chromosome and an egg with one X chromosome.
A sperm with XX chromosomes and an egg with XY chromosomes.
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1 markWhich of these is an example of discontinuous variation?
Body weight
Hand span
Height
Sex
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1 markCystic fibrosis is a genetic condition caused by a recessive allele (f).
Which is the genotype of a person with cystic fibrosis?
Heterozygous and ff
Heterozygous and Ff
Homozygous and ff
Homozygous and FF
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1 markEach cell in the eye of a kangaroo has 16 chromosomes.
How many chromosomes are there in one kangaroo sperm cell?
4
8
16
32
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1 markThere are two main types of reproduction, sexual and asexual.
Which is an advantage of sexual reproduction?
Creates more variation
Produces larger numbers of offspring
Produces offspring that are all identical so well adapted
Only needs one parent
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1 markAn organism has the genotype TT.
Which term describes this organism?
Heterozygous dominant
Heterozygous recessive
Homozygous dominant
Homozygous recessive
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1 markWhich process produces gametes?
Diffusion
Fertilisation
Meiosis
Mitosis
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1 markThe table describes meiosis.
| Genetic description of cells made |
Genetic variation introduced |
Type of cells made | |
| A | haploid | ✓ | body cells |
| B | diploid | ✖ | body cells |
| C | haploid | ✓ | gametes |
| D | diploid | ✓ | gametes |
Which row in the table is correct?
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1 markThe table shows features of meiosis.
| Type of cells made | Genetic variation introduced | |
| A | body cells | ✓ |
| B | body cells | ✖ |
| C | gametes | ✓ |
| D | gametes | ✖ |
Which row in the table is correct?
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1 markScientists found DNA from a Stone Age woman trapped in gum from a tree. The woman had chewed the tree gum. Using this DNA scientists were able to predict some of her features.
Which feature would scientists have been able to predict from her DNA alone?
Body weight
Diet
Eye colour
Height
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1 markThe diagrams show gametes and sex chromosomes.
Which diagram shows the correct combination of sperm and egg to produce a male baby?
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1 markTigers have a diploid number of 38 chromosomes.
How many chromosomes are present in a tiger sperm cell?
2
19
38
72
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