Biology by Bradford
7.3.ASelective breeding
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7.3 Artificial Selection: revision map
The subtopic in the middle and four tasks round it: label a diagram, complete a table and fill 7 gaps. Every box rests on a learning objective of the topic in the AP Biology course and exam description. Type into the blanks and check them, or print it on A4, Letter or A3 with an answer key.
Artificial Selection
AP Biology ยท Unit 7 Natural SelectionHover over a box to see it. Untick it to leave it off this sheet and its printout.
Name7.3.AWhat breeding does
In artificial selection, people choose which individuals breed, so only those with chosen traits pass on their alleles. Repeated over generations, this shifts the of the trait, and the process is evolution just like natural selection. Wild mustard has been bred into broccoli, kale, cabbage and others by choosing different parts of the plant, from the leaves to the flower buds.
Topic 7.3Artificial Selection
7.3.ANatural and artificial selection
| Natural | Artificial | |
|---|---|---|
| What chooses | the environment | |
| What is favored | survival and reproduction in that environment | traits people want |
| Speed | usually slow | can be fast, as the choice is strong |
| Examples | camouflage, antibiotic resistance | dog breeds; crops from wild mustard; corn from teosinte |
7.3.AThe costs
Breeding a few individuals with a trait reduces genetic , and mating of close relatives raises the chance that offspring are homozygous for harmful recessive alleles. Many pedigree dogs suffer from breed-specific diseases, and crops grown as a single genetic variety can all be wiped out by one disease because none carries resistance.
Word bank diversityhumansmeanoffspringoriginal populationselected individualstrait value
Answer key
Every box on the sheet with its gaps filled in, as the subtopic reads in full.
LabelSelective breeding
- selected individuals
- original population
- offspring
- trait value
TableNatural and artificial selection
Natural Artificial What chooses the environment humans What is favored survival and reproduction in that environment traits people want Speed usually slow can be fast, as the choice is strong Examples camouflage, antibiotic resistance dog breeds; crops from wild mustard; corn from teosinte GapsWhat breeding does
In artificial selection, people choose which individuals breed, so only those with chosen traits pass on their alleles. Repeated over generations, this shifts the mean of the trait, and the process is evolution just like natural selection. Wild mustard has been bred into broccoli, kale, cabbage and others by choosing different parts of the plant, from the leaves to the flower buds.
GapsThe costs
Breeding a few individuals with a trait reduces genetic diversity, and mating of close relatives raises the chance that offspring are homozygous for harmful recessive alleles. Many pedigree dogs suffer from breed-specific diseases, and crops grown as a single genetic variety can all be wiped out by one disease because none carries resistance.