Beyond Mendel Flashcards
What is co dominance?
Not mixed - both alleles in the genotype are seen in the phenotype - roan - Big letter and lil letters with
What is complete dominance?
Only one allele in the genotype is shown in the phenotype
What is incomplete dominance?
Mixed - A mixture of the alleles in the genotype are seen in the phenotype
What are multiple alleles?
Blood groups ABO
What are lethal alleles?
Overo horse - If it has two overo parents it will die
What is epistasis?
One gene masks another gene - Pigment or no pigment, no new phenotypes produced.
Gene 1 - coat colour B dominant to b (black and brown)
Gene 2 - deposition C dominant to c (deposited and non)
What is pleiotrophy?
Single gene causing multiple phenotopic traits, a polled gene caused horns and sex development
What does the Y chromosome in males have?
SRY region responsible for testes protein
What chromosome do sex linked disorders occur on?
The X chromosome
What are some X linked traits?
Colour blindness (deutan type): Insensitivity to green light
• Colour blindness (protan type): Insensitivity to red light
• Haemophilia A: Lack of clotting factor VIII
• Haemophilia B: Lack of clotting factor IX
What is haemophillia?
Sex-linked recessive trait defined by absence of certain proteins (clotting
factors) required for blood clotting.
What is Duchenne Muscular Dystrophy?
Sex linked recessive trait, do not produce the protein, weak bones,
