Your Subtitle Goes Here Surgeon Brooks

Life Science Chapter 8 Genetic Changes

Mutations 1. Mutation = any change in genetic material. Example: Albinism - pigment 2. Mutations happen any time, randomly 3. Mutations are mostly harmful 4. Lethal mutations – cause death before or after birth

Albinism

Types of Mutations 1. Gene Mutation = changes in the sequence of bases A. Produces wrong code in RNA B. Sometimes no effect – eye color mutates in a skin cell C. Sometimes minor effect – mole D. Sometimes lethal E. Example of a screw falling into a clock!

Somatic & Germ mutations 1. Somatic Mutation = mutation in a body cell - cells that do not make gametes 2. Germ Mutation = occur in gametes or cells that form gametes A. Do not effect organism, but can effect offspring B. Most are recessive C. After several generations, possible to get mutated trait

Chromosomal Changes 1. Defined: mutation involving the number of chromosomes. 2. Small or large effect on organism 3. 2 set of chromosomes = diploid 4. Unusual number = ploidy mutations 5. Down’s syndrome = ploidy mutation. They have three sets on the 21 st chromosomes. (47 instead of 46)

Down’s Syndrome

Seedless Watermelon Japan’s Square watermelon?

Facets of Genetics: Human Disorders 1. Carrier = has gene but does not express the trait 2. Queen Victoria & hemophilia =bleeder’s disease, found in 1 in 10,000 males (sex- linked) 3. Duchene = type of muscular dystrophy (sex-linked) 4. Cystic Fibrosis = affects mucous and sweat glands (recessive) 5. Tay Sachs =lack enzyme that breaks down fatty substances (recessive) 6. Malignant hyperthermia – high fever under anestheia (dominant gene) 7. Achondroplasia = arms and legs do not grow properly (dominant)

Tay Sachs Disease

Malignant Hyperthermia Scientist experiment on a dog to help humans

Duchene’s Disease

Cystic Fibrosis

8B Applied Genetics 1. Some produce unusual traits that are beneficial 2. We then will breed to preserve the trait 3. Example Ancon sheep & Mink

Mink

Ancon Sheep Your subtopic goes here

Applied Genetics 1. Selection – Jacob’s flock in OT A. Selective breeding Breed selected traits (plants – corn example, p.114) B. Inbreeding is mating an organism with its close relatives – goal is for pure breed with desirable traits (Animal – chickens, Plant = self- pollination) C. Many new breeds began from plants or animals that mutated

Cross Breeding 1.Involves breeding individuals with different traits to produce offspring different from both parents 2. Hybrid vigor = offspring stronger than parents. 3. Hybrids produce different offspring 4. Takes many years to get hybrids to produce offspring alike (ex: shorthorn cattle – good meat, Brahams cattle – like cold) 5. Sometimes with breed organisms from different groups a) doesn’t work with animals b) successful w/ plants (tangelos)

Tangerine + Grapefruit = Tangelo

The New Genetics 1. Genetic engineering = use of special techniques to control the genetic makeup We… A. Isolate genes and transfer them to other cells B. create super crops like frost resistant tomatoes C. could form a disease that could destroy many things

Tomatoes….

Human Genetic Engineering 1. Human genetics – 2 views A. We are made in the image of God, precious creation. B. We have the God-given ability to learn and direct our lives. 2. Not good or bad alone 3. Is science qualified to answer the moral questions that genetic engineering raises? 4. Would a genetically engineered human race solve our problems?

Facets of Genetics 1. Human Genome Project = map all human genes! We did it! 2. Identical twins = sperm + ovule = zygote. Zygote then divides and forms two identical individuals. (Clones) 3. Fraternal Twins = 2 sperm + 2 ovules = 2 zygotes. Born at the same time but genetically different. Can be 2 girls or 2 boys, or one of each!

Identical or Fraternal Twins

Identical Twins

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Fraternal Twins

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Transitional Page

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