Why are a persons characteristics a mixture of the characteristics of their parents
Genes work in pairs, one being inherited from each parent
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How many chromosomes do sperm and egg cells have each
23 each
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What happens to a sperm and ovum in fertilisation
A fertilised egg has 23 matched pairs and so develops into an embryo with a mixture of the parents characteristics
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how can selective breeding lead to new varieties of plant or animal
it produces better animals and plants, by taking the best plants or animals from the existing stock.
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give 3 examples of the results of selective breeding
1)disease or frost resistant crops can be developed 2)pedigree dogs are bred for fashion or to exaggerate certain behaviour 3)domestic livestock are selectively to produce more milk or better, tastier beef.
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What is the difference between a vertebrate animal and an invertebrate animal?
vertebrates= animals that have a backbone invertebrates= animals that don't have a backbone
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Are fungi animals or plants or neither
neither
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Give an example of a mollusc
snail
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What do keys help you do
keys are used to identify creatures
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2 rules for using keys
1)Take one creature at a time and go throughout he questions for that creature only 2)Follow the instructions on each question for whichever answer is true
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Other cards in this set
Card 2
Front
What is a characteristic feature
Back
Any difference between individuals of the same species
Card 3
Front
Name a characteristic which is impossible to spot from looking on the outside
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