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©1998 Timothy G. Standish Human Genetics Timothy G. Standish, Ph. D.
©1998 Timothy G. Standish The Madness of King George III Partly as a result of the erratic behavior of King George III the American colonies decided to break away from the United Kingdom Other members of King Georges family also exhibited strange behavior with dire consequences. These included Mary Queen of Scots and her son James I both of whom were beheaded. Because madness seems to have run in the family, it is thought thought to have a genetic basis Acute intermittent porphyria seems to be consistent with the symptoms exhibited by George III
©1998 Timothy G. Standish Human Heredity Is Not Unique The genes of humans behave in the same way as genes of other organisms Of the estimated 100,000 human genes, most are identical in all humans The relatively small number of polymorphic genes in humans account for only part of the variability that we see between humans While each human (except for identical twins) has a unique set of genetic information, variation between humans also results from differences in the environment
©1998 Timothy G. Standish Politics and Genetics Because we are talking about how humans are when we are talking about human genetics, there can be lots of controversy when traits are seen as relating to race, gender or other sensitive issues This is particularly true when we start to talk about the genetics of behavior Nazis and other extreme right wing politicians see human worth and behavior being based on genetics Communists and other extreme leftwing politicians see humans as infinitely pliable and molded by their environment not genetics
©1998 Timothy G. Standish Simple Dominant/Recessive Traits Many human genes are inherited as dominant or recessive traits just like the traits Mendel studied in peas Ear lobes provide an example of this: Attached ear lobes are inherited as a recessive trait. Unattached ear lobes are inherited as a dominant trait.
©1998 Timothy G. Standish Simple Dominant/Recessive Traits Having a bent little finger is a dominant trait
©1998 Timothy G. Standish Dominant/Recessive Human Traits Albinism - There are a number of different types of albinism, but each is characterized by an absence of pigment from the skin, eyes and hair. Albino individuals typically have very pale white skin, light blue or pink eyes, and light blond or white hair. Albinism is a recessive trait. Brown teeth - Teeth have a brown color that is not the result of poor oral hygiene or antibiotics taken as a child. White teeth are dominant.
©1998 Timothy G. Standish Dominant/Recessive Human Traits Cleft chin - A noticeable indentation at the center of the chin. For examples think of Kirk Douglas and Michael Jackson (after plastic surgery). Having a cleft chin is dominant to a smooth chin. Double-jointed thumbs - This is commonly called a hitchhiker's thumb. The thumb can bend back at almost 90 degrees. Hitchhiker's thumb is a recessive trait, but it may vary in its expression.
©1998 Timothy G. Standish Dominant/Recessive Human Traits Hand folding - When the hands are folded either the left or right thumb will be on top. Left thumb on top is dominant. Mid-digital hair - Hair growing from the middle section of each finger. Hair presence is dominant. PTC tasting - Phenylthiocarbamide (PTC) is a bitter tasting chemical that cannot be tasted by some individuals. PTC tasters taste PTC as bitter, non-tasters taste nothing when given PTC. Tasting is dominant to the inability to taste PTC.
©1998 Timothy G. Standish Dominant/Recessive Human Traits Tongue rolling - Tongue rolling is the ability to form a tube with your tongue. Rolling is dominant. Widow's peak - A sharp point in the hairline that points toward the nose. Having a widow's peak is dominant to a smooth hairline.
©1998 Timothy G. Standish Sex Influenced Human Traits Baldness - Loss of hair from the scalp following puberty. A sex influenced trait that is most commonly fully expressed (as a dominant trait) in males, but carried on an autosome Index finger shorter than ring finger - The index finger (next to your thumb) is longer than the ring finger (next to your little finger). Check the class data to see if the frequency is different for the different sexes.
©1998 Timothy G. Standish Sex Linked Human Traits Color blindness - Inability to distinguish between colors of the same intensity. There may be two types, red green color blindness in which individuals perceive red and green as the same color, and complete color blindness in which all colors are perceived as being the same and vision is the functional equivalent of black and white television. Both types of colorblindness are sex linked traits.
©1998 Timothy G. Standish Dimples - Round indentations in the cheeks when smiling, not lines or clefts. Freckles - Small patches of darker pigmented skin on various parts of the body and most visible in those areas commonly exposed to the sun. These may be present on both dark and light skinned individuals. Hair whorling - These may be referred to as cowlicks. Areas in which hair grows from your scalp in a whorl instead of in a given direction. Specific Human Traits
©1998 Timothy G. Standish Myopia - Short sightedness, the inability to see far off objects without correction by glasses or contacts Polydactyly - Having more than five digits on each hand and foot. S-methyl thioester smeller - S-methyl thioesters are produced in the urine after consumption of asparagus. Some individuals cannot smell this substance. If you smell a strong odor on urination after eating at least 5 asparagas spears, you are an S-methyl thioester smeller. Specific Human Traits
©1998 Timothy G. Standish White forelock - A white patch of hair at the front of the scalp. Specific Human Traits
©1998 Timothy G. Standish Multiple Alleles Eye color is determined by more than one gene Thus eye color appears to vary on an almost continuous scale from brown to green to gray to blue Eye color is determined by two genes, one controls texture of the iris which refracts light to make blue. A second determines relative abundance of melanin. When a small amount of melanin is present, green eyes result while brown and black eyes result from relatively increasing amounts of melanin
©1998 Timothy G. Standish Multiple Alleles Hair color is determined by more than one gene Thus hair color appears to vary on an almost continuous scale from black to brown to blond to red The brown and black pigment is melanin The red pigment is an iron containing molecule
©2000 Timothy G. Standish Human Genetics Timothy G. Standish, Ph. D.
Human Genetics Biology Honors. Human Chromosomes Autosomes – 44 chromosomes that everyone has no matter what sex they are Autosomes – 44 chromosomes that.
Species – Genetic Variation Main Points for Class Meeting: Main Points for Class Meeting: 1. What is a Species? 2. What makes species different from each.
Human Heredity Biology. What single gene traits do you have? Controlled by one dominant or recessive gene Does dominant mean the same as most common?
You are Here Review of what we know so far.... Classical Genetics (Mendelian Genetics) Genes and alleles Genes and alleles Dominant v. Recessive Dominant.
Human Genetics What Genes do you have?. What is a trait? “Your Mom gives you ½ of the instructions, your Dad gives you the other ½.” In science jargon:
Human Traits Lab. Objectives: Objectives: 1) To observe some inherited traits. 2) To see whether dominant traits are more common than recessive traits.
Dominant and Recessive Traits in Humans. There are over 200 traits that are transmitted from generation to generation in humans. These interesting.
Date EntryPage # 1/8 Genetic Terms5. Genetics Terms 5 1. Genetics – 2. Heredity – 3. Traits – Turn to page 5 in journal and write the terms below. Skip.
Human Traits. Ear Points - also called Darwin's Point.
Human Traits Pick A Partner !!. Shape of Face Dominant: Oval faceRecessive: Square Face.
#1 Skin Pigment Dominant: Pigmented Skin, eyes, hair PP or Pp Recessive: Albino- no pigment pp.
Human Traits. Bent Pinky Straight pinky (recessive trait) Bent pinky (dominant trait): where tips of pinkies point away from one another.
You and Your Genes Background Have you ever noticed that sisters look alike? Or have you even had difficulty telling them apart. Their inherited traits.
General Genetic Bio 221 Lab 7. 1-Widow's Peak (W, w) front hairline : Dominant allele in heterozygous or homozygous individuals results in a V-shaped.
Dominant-Recessive Lab Human Inherited Characteristics.
Sloppy Science Genetics Made Simple but by No Means 100% Accurate.
Dominant Human Traits Do you have them?. DOMINANT HUMAN TRAITS only one dominant allele is needed (you only have to inherit it from one parent) if you.
Lab Exercise 40 BI 233 Genetics and Heredity. Definitions Heredity = the inheritance of traits Genetics = the study of mechanisms of heredity. Genes:
Genetic Variations Spring Vocabulary Phenotype = Physical Characteristics Phenotype = Physical Characteristics Genotype = Genetic code for characteristics.
Human Genetics. We are all a combination of genes and traits from our parents.
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A Survey of Human Traits. Trait A feature you inherit. (eye color, freckles, body structure, etc.)
Genotype to Phenotype To help you determine what your baby will look like.
1 copyright cmassengale. PTC Tasters PTC tastes very bitter. For others, it is tasteless. The ability to taste PTC shows dominant inheritance and is controlled.
A trait is inherited from from genes that are found on DNA.
Trait Inventory. Detached VS. Attached Earlobes Detached Earlobes Attached Earlobes.
Fundamentals of Genetics Chapter 9. Trait DescriptionClass numbers Tongue rolling Dimples Widow ’ s peak Hitchhiker ’ s Thumb Hand clasping, left over.
Chapter 7 Growth and Inheritance Chapter 7 Growth and Inheritance Lesson 2: How Are Characteristics Inherited?
What traits do we inherit from our parents?. What does the word prevalent mean? Predictions?
#1 - Earlobes Dominant Free They hang below the point of attachment to the head. Recessive Attached They are attached directly to the side of the head.
Genetic Traits. What is a genotype? How a person looks based on your genes. A person can inherit from mom/dad genes. These genes can be dominant or recessive.
Genetic Terminology. What makes these two individuals so similar?
Wednesday Nov What is a trait that you do not have but would like to have? 2. Why would you like to have that trait?
Introduction to Genetics Analyzing Inheritance Chapter 6 Section 3.
Human Genetics. Linkage & Gene Maps Some traits almost always appear together (red hair & freckles) Some traits almost always appear together (red hair.
Name ___________________________________ Date ____________________ Period ______________ Your Own Pair of Jeans Genes So you think genetics doesn’t apply.
How do characteristics within a species vary? variability is important for survivability some variations are based on genetics –heritable traits (e.g.
The study of genes and the inheritance of traits.
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Genetics A. The Vocabulary of Genetics 1. Chromosome – bar-like structures of tightly coiled chromatin (DNA), visible during cellular division 2. Homologous.
Human Traits Inherited characteristics. What if aliens visited our planet and thought that all humans are alike…. Are we? We are certainly different than.
Human Traits Lab Dimples are dominant Cleft chin is dominant Wet ear wax is dominant… I have the recessive “dry” ear wax.
Genetics! The study of heredity. Heredity: The passing of traits from parents to offspring Traits: Characteristics that are inherited – Hair color, eye.
Genetics & Heredity. Heredity or Environment? Color of hair Color of eyes Color of Skin General health Personality traits Strength of eyesight.
Inherited Traits 5 th Grade Science Ms. Felisha Harper Marshall Elementary School.
Introduction to Genetics Chapter 11. Look around the room… What color is your hair? Look at the chart and write down your hair color. Write down the colors.
Gregor Mendel Born in 1822 in Czech Republic Priest who studied mathematics and science at the University of Vienna Spent the next 14 years working.
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