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Published byLandon Sawyer
Modified over 3 years ago
Incomplete Dominance The heterozygous (hybrid) phenotype is somewhere in-between the homozygous phenotypes If R = red and r = white Rr = pink
We still use capital (dominant) and lowercase (recessive) lettersAnd the same letter!
Co-Dominance Both alleles of a gene are expressed – Equal dominance (like co-workers) We write alleles as 2 different capital letters BB = Black feathers WW = White feathers BW = Speckled black and white feathers
Black (BB) White (WW) Black & White (BW)
White (WW) Red (RR) Roan (RW)
Multiple Alleles A gene that is controlled by 3 or more allelesBlood Groups – ABO IA :has only antigen A IB : has antigen B i: has neither antigens = Type O IAIB : has both A and B antigens
Blood Transfusions Recipient – receives blood Donor – donates bloodYou can only receive blood that has the same antigens on its cells
Rh Antigen Rh antigen is also found on red blood cellsDo not have antigen = Rh negative Have antigen = Rh positive
Sex-Linked Females = XX Males = XYIf a trait is carried on the X chromosome, a male has only 1 copy It is more likely that a recessive trait will show up on a male than a female. Why?
Polygenic Traits Many genes are involved in controlling the phenotype
Incomplete and Codominance. Simple Inheritance Mendel studied simple patterns of inheritance. Mendel studied simple patterns of inheritance. Found that.
When Genetics is Not Simple
Beyond Dominant and Recessive Alleles. The whole story... Not all phenotypes are dictated by dominant and recessive alleles (in fact, very few are). Some.
Unit 5 – Other forms of inheritance Not all traits are simply dominant or recessive, with only 2 possible alleles.
© Boardworks Ltd of of 11© Boardworks Ltd 2010 Homozygous cross.
Unit 5 – Other forms of inheritance Non-Medelian Inheritance Not all traits are simply dominant or recessive, with only 2 possible alleles.
Incomplete dominance This is when neither allele is dominant.
PATTERNS OF INHERITANCE. What type of inheritance pattern is represented?
Incomplete Dominance & Codominance Section 11-3 in Book.
Non-Mendellian Traits What happens when its not all dominant ?
Beyond Dominant and Recessive Alleles. There are important exceptions to Mendel’s discoveries Not all genes show simple patterns of dominant and recessive.
Who is the Father of Genetics?. Mendel a type of gene that is hidden by a dominant gene.
REVIEW GENETICS- the study of heredity. Inheritance Traits are specific characteristics inherited from parents Genes are the factors that determine traits.
OTHER PATTERNS OF INHERITANCE
Incomplete Dominance Neither allele is dominant over the other Heterozygous offspring have a phenotype that is somewhere between the two.
Not all traits are simply inherited by dominant and recessive alleles (Mendelian Genetics). In some traits, neither allele is dominant or many alleles.
Other Patterns of Inheritance. Exceptions to Mendel’s Rules There are exceptions to every rule, and exceptions to the exceptions. Question: What happens.
Unit 5 – Genetics Other forms of inheritance Not all traits are simply dominant or recessive, with only 2 possible alleles.
Beyond Dominant and Recessive Alleles. Incomplete Dominance: when neither allele is completely dominant over the other. · Results in the heterozygous.
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