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Inheritance160-page14 - for the gene • Example A,B,O...

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Inheritance Patterns - 14 B . Co-Dominance Both alleles are equally expressed in the heterozygote - both appear in the heterozygous individuals Examples Roan Cattle (Red X White cows) Blue Andulusian Fowl (Black X White) A-type and B-type Red Blood Cell Coatings Lack of Dominance is just one of the many different ways that genes are expressed. Multiple Alleles of One Gene The "typical" gene has two alleles, one for each of the homologous chromosomes. This is the same for individuals and within the population. For some genes, however, there can be more than two alternative alleles at the single gene locus among members of the species. A diploid individual can inherit just two of the possible alleles (one on each of the homologous chromosomes) The effects are shown in the study of the population's variation in phenotypes
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Unformatted text preview: for the gene. • Example: A,B,O alleles for human rbc coats, the "I" gene. The I A (A) and I B (B) alleles are co-dominant. The i (O) allele is recessive Blood Type Genotype Red Blood Cells AB AB I A I B A AA or AO I A I A or I A i B BB or BO I B I B or I B i O OO ii Inheritance of ABO Blood Type Antigen-Antibody Reactions One consequence of the inheritance of the ABO blood type is that the A and B coatings are antigens, and can trigger antibody reactions in non-complementary individuals. This is important for blood transfusions, but not in genetics. In reality, there are variant alleles for each of the blood types beyond those discussed in biology classes....
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