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Inheritance Quiz

The 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?
If a Y chromosome is present then it must be a boy
If a Y chromosome is present then it must be a girl
If an X is present then it must be a boy
If an X chromosome is present then it must be a girl
Why does a dominant allele create a higher probability of an offspring affected by a disease, such as cystic fibrosis?
Only one dominant parental allele is needed to produce a 50% chance of an individual being affected by a particular genetic condition
The parents always pass on these alleles
Dominant alleles are more common than recessive alleles
Why is fertilisation a random process?
This process is random because a few sperm and eggs are released at a specific time
It is always known which sperm and egg will fuse during fertilisation
It is not known which sperm and egg fuse during fertilisation
What phenotype is produced from an XY genotype?
Female
Male
Cystic fibrosis
Why does cystic fibrosis need two alleles to cause the disease?
It is a recessive disorder - you need two recessive alleles to cause the condition
The alleles are dominant and you need two of them
You need a dominant and a recessive allele to cause the condition
What is an example of a dominant genetic disorder?
Cystic fibrosis
Tuberculosis
Polydactyly
In a recessive condition, such as cystic fibrosis, how many copies of the abnormal allele are needed for the person to be a sufferer?
1
2
3
4
What is the name of the technique used to test a foetus for genetic disorders?
IVF
Cloning
Embryo Screening
Stem Cells
In humans, genes are found in...
Pairs
Threes
Singly
Fours
What is a carrier?
A person who has the disease and always passes it on to their offspring
A person who is unaffected by the disease but can pass on the gene
A person unaffected and incapable of passing on the condition through their genes
A person infected who can spread the disease through a droplet infection
What offspring ratio would you expect from two parents who are carriers - Tt crossed with Tt?
1:1
2:1
3:1
4:1
What are alleles?
Different forms of an organism
Different forms of a cell
Different forms of an enzyme
Different forms of a gene
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