How do We Make Our World “better?”

Biology Standard 5c and d

Modifying our Living World with DNA!

• AKA Mating• By choosing the “best” individuals of a species and breeding them, you can get

the “best” offspring.

Breeding

• Allowing those orgs w/ desired characteristics (DNA) to produce next gen.

• Based on phenotype (what animal looks like)

• Genotype (DNA) codes for phenotype.

              

       

Selective Breeding

Selective Breeding: Super Cow!

Selective Breeding

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Hybridization

• Crossing dissimilar individs to bring together best of both orgs.

• Can make orgs disease resistant; sterile!

Hybridization

Liger

Hybridization: Zorse

Hybridization: Zedonk

Hybridization: Prizzly Bear

Hybridization: Tomacco

Hybridization: Wolf/Dog

Inbreeding

• Continued breeding of individs with

similar characteristics.

• Risky! Genetic defects!

• Too many recessive alleles

(not dominant traits) Hemophilia: The Royal

Disease: Queen Victoria

X linked Hemophilia

Royal Pedigree

No Sex with Your Siblings!

• Inbreeding is dangerous b/c when 2 individs mate that are genetically similar, recessive disorders are kept inside the family and are

passed to offspring.

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