Selective Breeding (OCR GCSE Biology A, Combined (Gateway Science Suite)): Flashcards
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Selective breeding
Selective breeding
Humans choose organisms to breed for desirable traits
Examples of desirable characteristics
Examples of desirable characteristics
More meat, disease resistance, big flowers
First step of selective breeding
First step of selective breeding
Choose parents with desired characteristics
Second step of selective breeding
Second step of selective breeding
Breed chosen parents together
Third step of selective breeding
Third step of selective breeding
Breed offspring with desired traits together
How long does selective breeding continue?
How long does selective breeding continue?
Many times until all have desired characteristic
Problem of selective breeding
Problem of selective breeding
Inbreeding
What inbreeding involves
What inbreeding involves
Breeding closely related individuals
Result of inbreeding
Result of inbreeding
Reduction of gene pool
Reduction of gene pool meaning
Reduction of gene pool meaning
Fewer different alleles
Risk from small gene pool
Risk from small gene pool
Species could become extinct
Why extinction risk w/ same genes
Why extinction risk w/ same genes
Less chance of survival advantage if environment changes
Another problem of small gene pool
Another problem of small gene pool
Greater chance of genetic defects
Why more genetic defects w/ inbreeding
Why more genetic defects w/ inbreeding
Recessive traits more likely to present