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In humans, cystic fibrosis is caused by a recessive allele, f. A man and a woman are both heterozygous for the cystic fibrosis allele. What is the probability that they will produce a girl who has cystic fibrosis?

The genotype for someone heterozygous for the cystic fibrosis allele would be Ff . Thus the father’s genotype (including sex chromosomes) would be FfXY and the mother’s would be FfXX . In order to work out t...
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Answered by Yasmin M. • Biology tutor
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When will a perfectly competitive firm shut down?

To answer to this question, it is crucial that the students understand the difference between variable and fixed costs.Variable costs relate directly to the level of production and are dependent on it. When ...
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Answered by Ilias D. • Economics tutor
3081 Views

why does silicon dioxide have such a high melting/boiling point?

It has a giant lattice structure, strong covalent bonds are difficult to break etc.
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Answered by Kian D. • Chemistry tutor
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Explain the importance of the separation of powers. (4 marks)

In the UK system, a separation of powers is maintained between the Houses of Parliament, the legislative body, Government, the executive body; and the courts, the judiciary. This separation of powers is impo...
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Answered by George N. • Law tutor
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Tom is making gift bags, each of which will contain two balloons. He wants to hide a sweet in one of the balloons. 20 balloons cost £1.33, 15 sweets cost £2.05. What is the minimum he needs to spend to make 35 bags?

First work out how many balloons he will need to buy . In order for each bag to have two balloons , he will need 70 balloons. Since he can buy 20 balloons at a time , this implies the minimum number he would...
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Answered by Peter T. • Maths tutor
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