Beyond Mendel. INCOMPLETE DOMINANCE Sometimes not all traits are completely ___________ or ___________, instead neither traits are dominant. When this.

Slides:



Advertisements
Similar presentations
When Genetics is Not Simple
Advertisements

Inheritance Patterns.
Complex Patterns of Inheritance
INCOMPLETE DOMINANCE AND CODOMINANCE 1. INCOMPLETE DOMINANCE  Neither allele has “complete” dominance over the other; heterozygous phenotype is a blend.
HUH? Snapdragons
Incomplete Dominance and Co-Dominance Taking it a step beyond Mendel 1.
10/21/2011.  A herd of cows vary in color. Some are black, some are white with black spots, some are white. The color and pattern on each cow are distinct.
4/11/ 12 Bell Ringer 1.What does incomplete dominance mean? 2.If I had a Red Homozygous Flower and a White Homozygous Flower, what would the Heterozygous.
Dihybrid Punnett Squares
Beyond Dominant and Recessive Alleles. Incomplete Dominance: when neither allele is completely dominant over the other. · Results in the heterozygous.
BEYOND MENDEL’S LAWS Heredity. Incomplete Dominance Review:  Inherited traits were either dominant or recessive  The dominant allele in an individual.
8.2 Alleles and Genes Interact to Produce Phenotypes AP Biology Radjewski.
Chapter 6: Introduction to Genetics Section 6-4: Different Types of Inheritance.
Polygenic Traits: Co-dominance & Incomplete dominance.
Blood types are based on the presence or absence of specific antigens on red blood cells; four blood types: A, B, AB, O.
Incomplete dominance.  Occurs when neither allele ‘dominates’ the other.
Beyond Dominant and Recessive Alleles. The whole story... Not all phenotypes are dictated by dominant and recessive alleles (in fact, very few are). Some.
Exceptions to Mendel’s Laws: Co-dominance Incomplete Dominance Multiple Alleles.
OTHER PATTERNS OF INHERITANCE
What is Codominance?.
12.2 Notes When Heredity Follows Different Rules.
Biology: More genetics
WarmUP In Labrador retrievers, yellow is incompletely dominant to black. The heterozygous phenotype is chocolate. Cross a yellow lab with a chocolate lab.
Punnett Squares: Codominance and Incomplete Dominance.
Chapters 6 and 7; Patterns of Heredity
WarmUP In Labrador retrievers, yellow is incompletely dominant to black. The heterozygous phenotype is chocolate. Cross a yellow lab with a chocolate lab.
Non-Mendelian Genetics
Blood Types and Skin Colors
Notes 20 - Simple Dominance, Incomplete Dominance, and Codominance
Codominance Notes Mrs. Callan 2017.
Unit 7 Genetics.
Multiple Alleles & Polygenic Traits
Non-Mendelian Genetics
Beyond Mendel.
Incomplete Dominance & Codominance
HW: Co-dominance Practice
HUH? Snapdragons
The gene for blood type has 3 possible alleles.
Punnett Squares: Part 2.
Punnett Squares: Part 2.
Beyond Mendel.
HUH? Snapdragons
Incomplete Dominance Incomplete Dominance: The heterozygous genotype produces a phenoytype that falls in between the dominant trait and the recessive trait.
Incomplete Dominance Incomplete Dominance: The heterozygous genotype produces a phenoytype that falls in between the dominant trait and the recessive trait.
Beyond Mendel’s Laws… Incomplete Dominance
OTHER PATTERNS OF INHERITANCE
When Heredity Follows Different Rules
UNIT 4: Genetics What are the different patterns of heredity: Incomplete Dominance, Codominance, and Multiple Alleles?   **Not all traits are represented.
Incomplete dominance and co-dominance
Incomplete Dominance Incomplete Dominance: The heterozygous genotype produces a phenoytype that falls in between the dominant trait and the recessive trait.
WARM UP Quiz – No talking, do not look at another person’s paper or you will receive a ZERO!!!
Variations in Heredity
Beyond Mendelian Genetics: Incomplete Dominance
4/11/ 12 Bell Ringer What does incomplete dominance mean?
Incomplete Dominance & Codominance.
Patterns of Inheritance
Other types of Inheritance
Incomplete Dominance.
Non-Mendelian Genetics
Non Mendelian Traits (Mendelian Exceptions)
Incomplete Dominance & Codominance.
Non-Mendelian Genetics
Incomplete Dominance & Codominance
Incomplete Dominance Incomplete Dominance: The heterozygous genotype produces a phenotype that falls in between the dominant trait and the recessive trait.
Variations on Mendel’s Themes
Punnet Squares Continued….
Inheritance Patterns.
Incomplete Dominance Codominance
Types of Dominance.
Mendelian Genetics: Dominant & Recessive Review
Presentation transcript:

Beyond Mendel

INCOMPLETE DOMINANCE Sometimes not all traits are completely ___________ or ___________, instead neither traits are dominant. When this occurs there is a ____________ of the two traits and it is called ______________________. Instead of having just ___ visible phenotypes, there are ___ The blended intermediate trait is always the ________________. Letters are always ________________ to show incomplete dominance. Ex. Red (_____) or white (_____) snapdragons are homozygous, while pink flowers are heterozygous (_____) dominant recessive “blending” incomplete dominance 23 third phenotype heterozygous RRR’R’ RR’

Perform a cross between 2 pink snapdragons and state the phenotypes and genotypes of this cross. P: F 1 : Genotype: Phenotype: RR’ x RR’ R RʹRʹ R RʹRʹ RRRR’ R’R’ RR: 2 RR’ : R’R’ 25% red, 50% pink, 25% white

CO-DOMINANCE In some cases both alleles are _____________ and both alleles are expressed in the heterozygous form. These alleles are said to be _______________. Ex.Feather colour in chickens is governed by 2 dominant alleles. Black birds are homozygous for the B allele and white birds are homozygous for the W alleles. The heterozygous is NOT grey as one would expect in incomplete dominance but instead a checkered pattern of both black and white feathers are seen. dominant co-dominant

Perform a cross between 2 checkered chickens. Give the phenotypes and genotypes of this cross. P: F 1 : Genotype: Phenotype: BW x BW BW B W BBBW WW BB : 2 BW: WW 25% black, 50% checkered, 25% white

MULTIPLE ALLELES When genes have more than ___ alleles they are said to have _________________ and are a result of multiple gene inheritance. Human blood types is an example where 3 alleles are involved: ______________. Each person has ___ of the 3 possible alleles, and each determines if the red blood cell possesses a certain glycoprotein. Type A has ___ glycoproteins, type B has ___ glycoproteins, type AB has ___________ glycoproteins and type O have ____ glycoproteins. The 3 alleles for human blood types are ___________. __________ are dominant over ____ __________ are co-dominant and expressed equally. 2 multiple alleles A, B, and O 2 AB A and B O I A, I B, i I A and I B i

PhenotypeGenotype A I A I A or I A i BI B I B or I B i ABI A I B Oi Can receive blood from: Can donate blood to: A and O B and O A, B, AB, and O O A and AB B and AB AB A, B, AB, and O

Another factor with blood typing is another glycoprotein called ____________. We know it as either ______ or ______ blood. If a person is ____ for antigen D, then their blood can recognize this and will accept blood from this donor. If a person is ____, then they cannot recognize this antigen, and if received their blood with coagulate and die  Type ____ is known as the _________________ because it can be received by any blood type. Type _____ is the ____________________ because it can receive any blood type. If a person received the wrong blood type, their red blood cells cannot recognize the foreign glycoproteins and the body attacks the new blood causing coagulation and death. Rhesus Rh+Rh- + - Ouniversal donor ABuniversal recipient

Ex.If a father with blood type B and a mother with blood type A have a child with blood type O, is this possible? Explain using Punnett squares. I B I B x I A I A I B i x I A I A I B I B x I A iI B i x I A i IAIA IAIA IBIB IBIB IAIA IAIA IBIB i IAIA i IBIB IBIB IAIA i IBIB i IAIBIAIB IAIBIAIB IAIBIAIB IAIBIAIB IAIBIAIB IAIBIAIB IA iIA iIA iIA i IAIBIAIB IB iIB i IAIBIAIB IB iIB i IAIBIAIB IB iIB i IA iIA ii ii i Yeah Baby!

Seatwork/Homework Read Section 4.4 (p. 142 – 145) Answer # 5 – 7, 9 – 12 (p. 146)