genetics heredity l.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Genetics & Heredity PowerPoint Presentation
Download Presentation
Genetics & Heredity

Loading in 2 Seconds...

play fullscreen
1 / 42

Genetics & Heredity - PowerPoint PPT Presentation


  • 694 Views
  • Uploaded on

Genetics & Heredity Who was Gregor Mendel? Who was Gregor Mendel? Austrian monk who studied mathematics and science As a boy he could predict the possible types of flowers and fruits that would result from crossbreeding two plants in his father’s garden Who was Gregor Mendel?

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Genetics & Heredity' - Gabriel


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
who was gregor mendel3
Who was Gregor Mendel?
  • Austrian monk who studied mathematics and science
  • As a boy he could predict the possible types of flowers and fruits that would result from crossbreeding two plants in his father’s garden
who was gregor mendel4
Who was Gregor Mendel?
  • Curiosity about the connection between the color of a pea flower and the type of seed that same plant produced inspired him to begin experimenting with garden peas in 1856.
  • Made careful use of scientific methods, which resulted in the first recorded study of how traits pass from one generation to the next.
what is genetics6
What is GENETICS?

The study of how traits are inherited through the interactions of genes.

what is a gene8
What is a GENE?
  • The material that controls which traits are expressed in an organism
  • Genes come in pairs and offspring inherit one copy of each gene from each parent
define the following terms
Define the following terms:
  • Heredity
  • Allele
  • Trait
define heredity
Define HEREDITY

The passing of traits from parent to offspring

define allele
Define ALLELE
  • The different forms of a trait that a gene may have
  • One form of a gene
define trait
Define TRAIT
  • Ways of looking, thinking, or being
  • Traits that are genetic are passed down through the genes from parents to offspring
describe recessive14
Describe RECESSIVE
  • A trait that is covered over, or dominated, by another form of that trait and seems to disappear
  • Hidden when the other copy of the gene contains the dominant allele.
  • A recessive allele shows up only when there is no dominant allele present
  • Shown with a lower-case letter
what is homozygous16
What is HOMOZYGOUS?
  • Both alleles [forms of the gene] are the same
  • When offspring inherit two dominant genes, (one dominant gene from each parent) they are said to be homozygous dominant
  • When offspring inherit two recessive genes, (one recessive gene from each parent) they are said to be homozygous recessive
what is heterozygous18
What is HETEROZYGOUS?
  • When alleles occur in different forms
  • When offspring inherit one dominant gene and one recessive gene, they are said to be heterozygous
  • Since the dominant gene will be expressed, they are said to be heterozygous dominant
describe co dominance20
Describe CO-DOMINANCE
  • When an organism has two different alleles for a gene that does not follow the dominant/recessive pattern
  • The organism shows a trait that is a blend of the traits represented by the two alleles
  • Also called INCOMPLETE DOMINANCE
describe co dominance21
Describe CO-DOMINANCE

For example:

The gene for the color of some flowers has one allele for red and one for white. When both alleles are present, neither is dominant, and the flower color is pink

describe dominant23
Describe DOMINANT
  • A trait that covers over, or dominates, another form of that trait
  • Trait that always shows up, even when only one of the two alleles is in the dominant form
  • Shown by a capital letter
define genotype25
Define GENOTYPE

An organism's genetic makeup

define phenotype27
Define PHENOTYPE

Outward physical appearance and behavior of an organism

what is a punnett square29
What is a PUNNETT SQUARE?
  • A tool to predict the probability of certain traits in offspring that shows the different ways alleles can combine
  • A way to show phenotype & genotype
  • A chart that shows all the possible combinations of alleles that can result when genes are crossed
what is a punnett square30
What is a PUNNETT SQUARE?
  • Letters stand for dominant and recessive alleles
  • An uppercase letter stands for a dominant allele
  • Lowercase letters stand for recessive alleles
read more about punnett squares here

Read More About Punnett Squares Here:

http://www.borg.com/~lubehawk/psquare.htm

list the 3 principles of heredity33
List the 3 Principles of Heredity
  • Traits are controlled by alleles on chromosomes
  • An allele’s effect is dominant or recessive
  • When a pair of chromosomes separate during meiosis the different alleles for a trait move into separate sex cells
what is meant by multiple alleles35
What is meant by MULTIPLE ALLELES?
  • A trait that is controlled by more than two alleles is said to be controlled by multiple alleles
  • Traits controlled by multiple alleles produce more than three phenotypes of that trait
what is meant by multiple alleles36
What is meant by MULTIPLE ALLELES?

For Example:

The alleles for blood types in humans are called A, B, and O

The O allele is recessive to both the A and B alleles

what is meant by multiple alleles37
What is meant by MULTIPLE ALLELES?

When a person inherits one A allele and one B allele for blood type, both alleles are expressed

The person has the blood phenotype AB

what is meant by multiple alleles38
What is meant by MULTIPLE ALLELES?

A person with phenotype A blood inherited an A and an O allele (AO)

~OR~

an A and an A allele (AA)

what is meant by multiple alleles39
What is meant by MULTIPLE ALLELES?

Someone with phenotype B blood has the genotype BB or BO

This person inherited either a B and an O allele

~OR~

Two B alleles

what is meant by multiple alleles40
What is meant by MULTIPLE ALLELES?

A person with phenotype O blood has the genotype OO

what is polygenic inheritance42
What is POLYGENIC INHERITANCE?
  • Occurs when a group of gene pairs acts together to produce a trait
  • The effects of many alleles produces a wide variety of phenotypes