Introduction to Mendelian Genetics - PowerPoint PPT Presentation

Loading...

PPT – Introduction to Mendelian Genetics PowerPoint presentation | free to download - id: 71b8e1-OGVkY



Loading


The Adobe Flash plugin is needed to view this content

Get the plugin now

View by Category
About This Presentation
Title:

Introduction to Mendelian Genetics

Description:

Title: Animated Summer II Author: oneillr Last modified by: oneillr Created Date: 2/26/2009 3:27:50 AM Document presentation format: On-screen Show (4:3) – PowerPoint PPT presentation

Number of Views:58
Avg rating:3.0/5.0
Slides: 26
Provided by: onei151
Category:

less

Write a Comment
User Comments (0)
Transcript and Presenter's Notes

Title: Introduction to Mendelian Genetics


1
Introduction to Mendelian Genetics
2
  • Genetics
  • The study of heredity
  • Heredity
  • How traits are passed down generation to
    generation
  • History
  • Gregor Mendel is known as the father of genetics

3
  • Gregor Mendel/1850s
  • Austrian monk
  • Study mathematics and botany at the University of
    Vienna
  • Use both of these areas of study to analyze
    genetic crosses using pea plants.

4
Mendel worked with 7 pea plant traits
5
Mendels experiments
6
(No Transcript)
7
Important terms to know
  • Gene
  • A segment of DNA that codes for a specific
    protein/trait.
  • Allele
  • A specific form of a gene
  • Dominant
  • The overpowering form of a gene
  • Occurs most often in a population
  • Represented by a capital letter
  • Recessive
  • The weaker form of a gene
  • Occurs less often in a population
  • Represented by a lower case letter

8
Important terms to know
  • Phenotype
  • A physical trait that you can see
  • Examples in peas tall, short, wrinkled,
    smooth
  • Genotype
  • The genetic make up /gene combination
  • Three types of genotypes
  • RR..Homozygous dominant
  • RrHeterozygous
  • rr. Homozygous recessive

9
The law of dominance
  • Simply stated
  • Anytime a dominant allele is present the dominant
    trait will be seen, it overpowers the recessive
    allele.

10
  • The ability to roll your tongue is dominant over
    the inability to roll your tongue.
  • Tongue roller . T
  • Non tongue rollert
  • Homozygous Dominant
  • TT
  • Tongue roller
  • -Homozygous Recessive
  • tt
  • Nontongue roller
  • -Heterozygous
  • Tt
  • Tongue roller

11
Karyotype
  • - A diagram created from a picture of a persons
    actual chromosomes.

12
Use of the karyotype
  • Used to determine if a person inherited a certain
    gene or genetic disorder
  • Used to determine the chance of passing a gene or
    genetic disorder on to their child
  • Used to determine the sex of a child.

13
(No Transcript)
14
Its a male
Why? XY
15
Its a female
Why? XX
16
Down Syndrome
17
Edwards Syndrome
18
Creating a karyotype
-Look at the length of the chromosome -Look for
the position of the centromere -Look at the
repeating pattern of light and dark bands
representing genes -Look at the specific genes
which have been identified and mapped/labeled
through the Human Genome Project.
19
Punnett Squares
A mathematical method to determine the chance of
producing an offspring with a specific trait.
20
1 Trait Crosses
Purple pea blossoms are dominant over white
blossoms Heterozygous purple flower crossed with
another Heterozygous purple flower
Results Genotypic ratio - 25 BB - 50
Bb - 25 bb
Phenotypic ratio -75 purple -25
white
21
In rabbits black fur is dominant over tan
fur. Cross a Homozygous dominant black fur male
with a Homozygous recessive tan fur female.
22
2 trait crosses
Yellow peas (Y) are dominant over green peas (y).
Green pea pods (G) are dominant over yellow pods
(g). Cross a Heterozygous green pea pod,
Heterozygous yellow pea with another Heterozygous
green pea pod, Heterozygous yellow pea GgYy x
GgYy
23
2 trait cross
In guinea pigs black fur is dominant over white
fur and smooth fur is dominant over rough
fur. Cross a Homozygous recessive white,
Heterozygous smooth fur female with a
Heterozygous black fur, Homozygous dominant
smooth fur male.
24
(No Transcript)
25
(No Transcript)
About PowerShow.com