Selective Breeding (OCR GCSE Biology A (Gateway Science Suite)): Flashcards
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What is selective breeding?
What is selective breeding?
When humans choose organisms to breed for desirable characteristics in offspring
Examples of desirable characteristics in selective breeding
Examples of desirable characteristics in selective breeding
More meat, disease resistance, big flowers
First step of selective breeding process
First step of selective breeding process
Choose parents with desired characteristics
How long is selective breeding repeated?
How long is selective breeding repeated?
Many times until all offspring have desired characteristic
Main problem with selective breeding
Main problem with selective breeding
Inbreeding
What inbreeding involves
What inbreeding involves
Breeding closely related individuals
Effect of inbreeding on gene pool
Effect of inbreeding on gene pool
Reduction of the gene pool
Why does gene pool reduce in inbreeding?
Why does gene pool reduce in inbreeding?
Number of different alleles reduces
Risk if environment changes with small gene pool
Risk if environment changes with small gene pool
Species could become extinct
Why extinction risk with same genetic make-up?
Why extinction risk with same genetic make-up?
Less chance of organisms having survival advantage
Another problem with small gene pool
Another problem with small gene pool
Greater chance of genetic defects in offspring
Why more genetic defects with small gene pool?
Why more genetic defects with small gene pool?
Recessive characteristics more likely to present