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B1: You and Your Genes ­ Answers
1. Offspring may have some similarity to their parents because of the combination of maternal and paternal
alleles in the fertilised egg; i.e. they have inherited some of the same genes from them.
2. We share many physical characteristics, even though there is…

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12. Parents pass on their genes to their offspring in their sex cells during fertilisation. Sex cells have copies of
half of each parents' chromosomes, so there are only 23 chromosomes instead of 46 (23 pairs), so there is
only one copy of each chromosome. This means that when a…

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fibrosis is caused by an over production of
mucus. This affects:
Breathing (lungs) -> can cause chest infections
Reproduction (testes)
Digestion (Digestive system) -> blocks…

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Not having children can have negative psychological effects, e.g. depression and can cause arguments.
There will also be no children to look after you in old age. It may also affect the extended family, i.e. not be
able to be grandparent

21. Advantages:

It informs the parents so that if…

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25. Genetic Screening: Testing the whole population for an allele. The decision is taken by the NHS and the
What must be considered:
It can be very expensive to test everyone for the allele
It can be better to spend the money on other things.
What benefits are there…

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2. Some plants produce side branches with plantlets on them. The Busy Lizzie plant does this.
31. Environmental factors might mean that clones are not identical. If one has optimum growing conditions and
the other doesn't then one will appear healthy, whereas the other will appear wilted.
32. Identical twins…


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