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Mr & Mrs Smith have a child who has Cystic Fibrosis, yet they do not personally suffer from the condition. Explain, with the use of genetic crosses, how this is possible and, if they had another child, how likely the second child will have Cystic Fibrosis

As neither of the parents have the condition, it therefore is assumed to be a Homozygous Recessive condition, so requires both the recessive alleles for the disease to be present in an individual (eg ff). As...
JN
Answered by Jack N. • Biology tutor
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Expand (t+5)(t-2)

FOIL stands for First,Outer,Inner and Last. This is the order of multiplying the terms from each set of brackets.First terms give: t x t=t 2 Outer terms give: t x -2=-2tInner terms give: 5 x t=5tLast terms g...
OS
Answered by Ollie S. • Maths tutor
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Name 3 things that can affect the activity of enzymes

1) Temperature : increasing the temperature increases the rate of reaction, however this can only happen to a certain point as beyond each enzyme's optimum temperature they get denatured (active site changes...
JC
Answered by Jessica C. • Biology tutor
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How do you solve inequalities when you have two inequality symbols in the expression, e.g. 4x - 6 < 14 < 3x + 2

So to tackle this question you have to imagine 4x + 6 &lt; 14 &lt; 3x - 2 as two separate inequalities.4x - 6 &lt; 14 and 14 &lt; 3x + 2 This still means the same thing but we have simplified it by looking a...
AP
Answered by Alice P. • Maths tutor
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Solve the simultaneous equations 3x - y = 5, x + 2y = -3

3x - y = 5 (A), x + 2y = -3 (B),6x - 2y = 10 (2A) ,7x + 2y +- 2y = 7 (2A) + (B),7x +2y - 2y = 7,7x = 7,x = 1,Sub x=1 -&gt; (A),3(1) - y = 5,3 - y = 5,-y = 2,y = -2 ,x = 1, x= -2
JC
Answered by Jessica C. • Maths tutor
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