SELECTIVE BREEDING

HUMAN INTERVENTION Changes that occur because of humans interfering with nature. Two Forms: Selective breeding Genetic Engineering

SELECTIVE BREEDING Selective breeding is done intentionally (on purpose) Done to pass on selected genetic traits through actual breeding or reproduction Done to produce desirable traits in both plants and animals Examples: breeders select dogs with certain colors, horses that are fast, cows that produce lots of milk, seedless watermelons

SELECTIVE BREEDING

Let’s study this mustard plant. Farmers over time have created new edible food varieties from just a simple mustard plant. Cabbage, Brussels sprouts, kohlrabi, kale, broccoli, and cauliflower are all the same plant species, but they look (and taste) different. How does this happen?

Some B. oleracea plants naturally had large terminal buds due to genetic variation (mutation). Farmers cross-bred these plants varieties together. The offspring plants had larger terminal buds. Over time, they produced the cabbage variety of this mustard plant.

SELECTIVE BREEDING The Liger is the result of breeding a female Tiger to a male Lion. It has stripes and spots. The stripes are from the tiger parent and the spots from the lion parent. On their hind legs, ligers stand approximately 12 feet tall. At most, ligers may weigh up to 1,000 pounds.

The Cama is the result of breeding a Llama to a Camel The Cama is the result of breeding a Llama to a Camel. Parents in background of picture.

The Zebroid is the result of breeding a female Horse and a male Zebra. The Zedonk / Zonkey is the result of breeding a female Donkey and male Zebra.

Geep - These are the result of a sheep and a goat.                                                                      Geep - These are the result of a sheep and a goat.

The Mule is the result of breeding a female horse to a male donkey. - The mule is superior to the horse in strength, endurance, intelligence and disease resistance.

Maroon & Red Bluebonnets

GENETIC ENGINEERING The selective, deliberate change of genes (genetic material) by man. The technique of removing, modifying or adding genes to change the information.

Genetically modified corn plant: Left: Regular corn with bugs Right: Modified corn that resists bugs

Alba: French created glowing rabbit.                                                                                                                     Alba: French created glowing rabbit. Genes from a jellyfish were added to an albino rabbit. In regular light, appears like any other furry white rabbit. But place her under a black light, and her eyes, whiskers and fur glow a otherworldly green.

                                                                                                                                    Scientists in the agriculture department of the Hebrew University have genetically engineered a chicken that has no feathers.