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A dun can't produce a cremello What is an important difference between the buckskin & dun genes? Genes at four other loci may modify the black What genetically, may affect a black horse to create different patterns? The fetus dies before birth when it has 2 dominant white genes Why are all dominant white horses heterozygous & not homozygous? Between the nucleus & the cell wall Where is the location of the cytoplasm? aaEE What letters of the alphabet signify pure black? 2 recessive genes. Chestnut is recessive to both bay & black What gene or genes must chestnut horses have to avoid being brown or black? Roaning gene, Rr What gene is responsible for the roan color & what letters represent it? All the foals from the homozygous black stallion would be black. From the heterozygous black stallion, by chance, half the foals would carry the recessive gene for brown & be brown or chestnut What would be the difference in the offspring from a homozygous black stallion & a heterozygous black stallion when mated with a chestnut or brown mare? Failure of the immune system to form What is CID? Two Horses that are heterozygous for a particular gene have how many different alleles for that gene? Bays What color results from crossing homozygous black horses with chestnut horses? The foal to develop certain nerves of the intestinal tract The lethal white syndrome is caused by the failure of what? A long, thread-like structure made of complex proteins What is a chromosome? Head section The genetic material of the sperm cell is contained in which part of the sperm cell? They are able to reproduce themselves What is the unique thing about genes & chromosomes?