Exceptions to Mendel’s Rules

Slides:



Advertisements
Similar presentations
Genetics Chapters 9-1 & 9-2. Incomplete dominance There is no dominant allele or recessive allele The 2 alleles are blended and make up a new physical.
Advertisements

Modes of Inheritance Exceptions to Mendel’s Principles.
BEYOND MENDEL’S LAWS Heredity. Incomplete Dominance Review:  Inherited traits were either dominant or recessive  The dominant allele in an individual.
1/12/15 Objective: What factors influence typical inheritance Do Now: Take out your HW genetics problems.
1/6/12 Objective: What factors influence typical inheritance? Do Now: -Take out Cyclops problem.
Beyond Dominant and Recessive Alleles. The whole story... Not all phenotypes are dictated by dominant and recessive alleles (in fact, very few are). Some.
Non-Mendelian Genetics
Punnett Squares: Codominance and Incomplete Dominance.
6d. Blood Typing Chapter 7.1 & 7.2.
Complex Patterns of Inheritance
Exceptions to Mendel’s laws
Mendelian Exceptions.
Genetics : Special Cases
Non-Mendelian Genetics
Bell Work 1/19 Hemophilia is a sex-linked, recessive trait. Which of the following describes the probability of hemophilia in the offspring of a man who.
Multiple Alleles & Polygenic Traits
Non-Mendelian Genetics
Complex Patterns of Inheritance
Complex Patterns of Inheritance
Non-Mendelian Genetics
Non-Mendelian Genetics
Complex Patterns of Inheritance
Blood Typing (3R).
Honors Biology Genetics
Beyond Mendel.
Incomplete Dominance & Codominance
Complex Patterns of Inheritance
Exceptions to the Rule of Dominance & Recessiveness
HUH? Snapdragons
The gene for blood type has 3 possible alleles.
Punnett Squares: Part 2.
Punnett Squares: Part 2.
Beyond Mendel.
Incomplete Dominance, Codominance, and ABO Blood Types
Incomplete Dominance, Codominance, and ABO Blood Types
Complex Patterns of Inheritance
Complex Patterns of Inheritance
Incomplete Dominance Incomplete Dominance: The heterozygous genotype produces a phenoytype that falls in between the dominant trait and the recessive trait.
Complex Patterns of Inheritance
Exceptions to Mendel’s laws
COMPLEX PATTERNS OF HEREDITY
Incomplete Dominance & Codominance.
Exceptions to Mendel’s Discoveries
Exploring Mendelian Genetics
Incomplete dominance and co-dominance
WARM UP Quiz – No talking, do not look at another person’s paper or you will receive a ZERO!!!
Beyond Mendelian Genetics: Incomplete Dominance
Non-Mendelian Genetics
Non-Mendelian Genetics
Non-Mendelian Genetics
Incomplete Dominance & Codominance.
Incomplete Dominance & Codominance.
Incomplete Dominance & Codominance.
11.3: Other Patterns of Inheritance
Incomplete Dominance & Codominance
Incomplete Dominance Incomplete Dominance: The heterozygous genotype produces a phenotype that falls in between the dominant trait and the recessive trait.
Incomplete Dominance Codominance Multiple Alleles
The Post-Mendel Era Exceptions to Mendel.
Incomplete Dominance Codominance Multiple Alleles
Review: Dominant/Recessive
Special Inheritance Patterns
Non-Mendelian Genetics
Non-Mendelian Genetics
Non-Mendelian Genetics
Warm Up With your partner, define genotype and phenotype.
Mendel’s Dominance Mendel’s rule of dominance was complete dominance
Not-so-Simple Inheritance Patterns
NOTES 22 – Complex Inheritance Patterns
Incomplete Dominance Codominance Multiple Alleles
The Post-Mendel Era Exceptions to Mendel.
Presentation transcript:

Exceptions to Mendel’s Rules Mendelian Exceptions Exceptions to Mendel’s Rules

Incomplete Dominance When the heterozygous genotype of a trait shows neither a dominant or recessive phenotype, but rather a mixture. Ex. Carnation flowers – dominant red allele and recessive white allele results in pink phenotype http://www.jerseyproduce.com/images/15-spray-carnations-fern.jpg

Incomplete Dominance Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. http://www.parkseed.com/product_images/2563.jpg

Incomplete Dominance

Codominance When the heterozygous genotype expresses both the dominant and recessive phenotypes at the same time Ex. Blood types – this is how you can have an AB blood type Sickle-Cell Anemia

Codominance Codominant Blood Type A Blood Type AB (Codominant) Blood Type O Blood Type B Blood Type A Type B O allele B allele A allele U.S. National Library of Medicine

Multiple Alleles More than two different alleles can exist for a particular trait, but only two can be present at any given time. Ex. Blood Types – This is how you can have A, B, AB, or O type blood. Phenotype Genotypes O ii A IAIA, IAi B IBIB, IBi AB IAIB

A O B AB BO O AO OO Blood Type Cross Parents: AO x BO Offspring Phenotypes: ¼ Type A ¼ Type B ¼ Type AB ¼ Type O B AB BO http://science.uwe.ac.uk/projectshowcase/blood_cells%20copy.JPG O AO OO

Blood Type Cross I A I B I B I A B I B i I A i I B i

Polygenic Inheritance When a phenotypic result is controlled by the added results of the effects of many genes Examples: Height Weight Skin Color Hair Color Eye Color

Polygenic Inheritance P generation X aabbcc AABBCC (very light) (very dark) X F1 generation AaBbCc AaBbCc