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Test Cross- Unknown GenotypeIs the purple plant homozygous or heterozygous ? Perform a test cross! Always! Cross the unknown with a homozygous recessive
Practice! P F1 ? x gg g g G g G g Phenotype: 100% green Genotype:Key: G=green g= yellow g G g G g F1 Phenotype: 100% green Genotype: 100% heterozygous g G g G g
Practice! ? P F1 ? x gg Phenotype: 50% green 50% yellow Genotype: Key:G=green g= yellow F1 Phenotype: 50% green 50% yellow Genotype:
Incomplete Dominance and Co-Dominance
Incomplete Dominance Neither allele is dominantIn some cases, an intermediate phenotype is shown
Snapdragons In snapdragons, flower color can be red, pink, or white. The heterozygous condition results in pink flowers rr Rr RR
Incomplete Dominance CrossKey: R= Red r= White F1 Phenotype: 100% pink F1 Genotype: 100% heterozygous Rr
F1 Cross Key: R= Red r= White Phenotype: 1:2:1 25% Red 25% White50% Pink Genotype: 1:2:1 25% homozygous RR 25% homozygous rr 50% heterozygous Rr
Other ways to represent incomplete dominance
Co-dominance Both alleles are expressed equallyNeither allele is more dominant than the other Erminette chickens Roan Cows
Co-Dominance Erminette ChickenKey: B =Black B1 = White Co-Dominance Erminette Chicken B B B1 B B1 B B1 B1 B B1 B B1 P generation Black chicken X White chicken F1 generation = erminette (checkered patterned) Phenotype: 4:0 or 1:0 100% erminette Genotype: 4:0 or 1:0 100% heterozygous
Erminette chicken BB BW BB BW Key: BB =Black BW = White Key: B= BlackB2 = White B2 B1 B2 B2 B2
Beyond Dominant and Recessive Alleles. Incomplete Dominance: when neither allele is completely dominant over the other. · Results in the heterozygous.
Chapter 6: Introduction to Genetics Section 6-4: Different Types of Inheritance.
Monohybrid Crosses These crosses involve one pair of contrasting traits. There are 5 different types which we will discuss.
Incomplete Dominance Incomplete Dominance: The heterozygous genotype produces a phenoytype that falls in between the dominant trait and the recessive trait.
Incomplete Dominance: The heterozygous genotype produces a phenoytype that falls in between the dominant trait and the recessive trait. Incomplete Dominance.
Genetics: Incomplete Dominance & Codominance Biology 12.
Incomplete Dominance Codominance Multiple Alleles
Genetic Crosses Section 9.2. Genotype The genetic makeup of an organism Consists of the alleles that the organism inherits from its parents Example:
INCOMPLETE DOMINANCE AND CODOMINANCE 1. INCOMPLETE DOMINANCE Neither allele has “complete” dominance over the other; heterozygous phenotype is a blend.
04/10/12 1.What does heterozygous mean? 2.What does homozygous mean? 3.What is a phenotype? 4.What is a genotype? 5.What three genotypes can an organism.
Incomplete and Codominance. Simple Inheritance Mendel studied simple patterns of inheritance. Mendel studied simple patterns of inheritance. Found that.
Incomplete Dominance Codominance In a nutshell!. Review: Dominant/Recessive One allele is dominant over the other (capable of masking the recessive allele)
Say What!?!?. One allele is not completely dominant over the other. - heterozygous phenotype always intermediate Ex. A cross between a recessive white.
Incomplete Dominance Codominance Multiple Alleles.
KEY CONCEPT Phenotype is affected by many different factors.
SBI 3U Incomplete Dominance Codominance. Mendel’s experiments illustrate complete dominance - offspring always resembled one of the two parents The dominant.
BEYOND MENDEL’S LAWS Heredity. Incomplete Dominance Review: Inherited traits were either dominant or recessive The dominant allele in an individual.
Incomplete Dominance & Codominance
Genetic Crosses How to predict the probable genetic makeup and appearance of offspring resulting from specified crosses.
Complex Patterns of Inheritance
INCOMPLETE DOMINANCE Incomplete Dominance- Pattern of gene expression in which the phenotype of a heterozygous individual is intermediate between those.
Chapter 12.2 Warm-Up Question 4/15/10 Essential Question: How do organisms change as they go through their life cycles?
When Genetics is Not Simple
Incomplete Dominance and Codominance. In Mendel’s work, alleles were either dominant or recessive. If yellow (Y) is dominant to green (y), then: –YY will.
Incomplete Dominance Neither allele is fully dominant over the other, but combine and display a new phenotype that is a blending of the two alleles EX:
OTHER PATTERNS OF INHERITANCE 1. Alleles for different traits are distributed to sex cells (& offspring) independently of one another. 2.
Where did it come from? Who invented it?. Undiscovered until 1901 Work was found! :D Reginald Punnett wanted to use it Help of G. H. Hardy But.
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.
Fundamentals of Genetics (chapter 9). Who was Gregor Mendel? ~An Austrian monk that is considered to be the “father of genetics” ~Used pea plants for.
Beyond Mendel. INCOMPLETE DOMINANCE Sometimes not all traits are completely ___________ or ___________, instead neither traits are dominant. When this.
Beyond Dominant and Recessive Alleles. The whole story... Not all phenotypes are dictated by dominant and recessive alleles (in fact, very few are). Some.
Vocabulary Get the definitions for the following terms from your text:
Genetics Review. Ready???? 1.Yes 2.No 10 Who became known as the father of genetics? 1.Watson 2.Einstein 3.Mendel 4.Bohr 10.
phenotypes genotypes heterozygous homozygous Tall Tt x Tt 25 % TT 25 % Tt 25 % tT 25 % tt 75 % tall 25 % short.
Complex Patterns of Heredity
Punnett Square Practice Problems. Create a punnett square to determine percent probabilities of genotypes and phenotypes of the offspring of a pea plant.
Biology In some cases, an intermediate phenotype is shown Neither allele is dominant In snapdragons, flower color can be red, pink, or white.
Genetics. Heredity Passing of genetic traits from parent to offspring Gregor Mendel discovered the principles of heredity while studying pea plants (“Father.
Beyond Dominant and Recessive Alleles. There are important exceptions to Mendel’s discoveries Not all genes show simple patterns of dominant and recessive.
Intro to Genetics What is an allele? –one of the alternative forms of a gene that governs a characteristic, such as hair color.
© Boardworks Ltd of of 11© Boardworks Ltd 2010 Homozygous cross.
Incomplete and Co-Dominance
Incomplete dominance This is when neither allele is dominant.
Mendelian Exceptions Chapter 11 Section 3. Mendel’s Principles Revisited Inheritance of biological _____________ is determined by individual units known.
Jeopardy GeneticsReview Click on slides to advance… click on home link to return to score board.
9-2: Genetic Crosses Help to predict the genetic makeup + appearance of offspring.
Do all genetic traits follow the rules of dominance & recessiveness?
Co-dominance, Incomplete Dominance, Polygenic Traits, and Multiple Alleles More about Mendel:: The Principle of Independent Assortment: genes for different.
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