One of the genes that determines coat color in dogs is the K gene, which specifies a protein that competes with the product of the A gene. The Kb allele specifies a protein that Blank______. Multiple choice question. cannot outcompete any protein made by any gene A allele outcompetes the proteins made by some of the gene A alleles (aw and at ) outcompetes any protein made by any gene A allele
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In dogs, genes A, K, and E specify proteins that control the production of light (pheomelanin) and dark (eumelanin) pigments in cells called melanocytes. Gene E specifies a receptor protein that spans the cell membrane and acts as a "switch". The proteins specified by the A and K genes control the switch. When the A protein is bound to the receptor, the switch is "off" and the melanocytes make pheomelanin; when the K protein is bound to the receptor, the switch is "on" and the melanocytes make eumelanin. The proteins specified by various alleles of the A and K genes differ in how tightly they can bind the receptor switch. This demonstrates that: 1. Interactions between alleles of different genes determine coat color in dogs. 2. Dog coat color serves as a good example of incomplete dominance. 3. Genes that code for dog coat color are codominant. 4. The dominance relations of a gene's alleles affect the alleles' transmission.
Madhur L.
In mice the dominant gene (A) determines the coat color known as agouti. Its recessive allele (a) determines black. When homozygous, the recessive gene (c) prevents pigmentation and results in an albino, while the dominant allele (C) allows the coat color genes to be expressed. Determine as many genotypes as possible in the following pedigree: Three alleles cannot be determined. Leave them blank. Agouti Black Albino
Sri K.
Miniature schnauzer dogs can have a few varieties of coat color: black, tanpoint, pepper and white. Three loci, E, K, and A are involved in coat color determination. For each variety, the genotypes of these loci are shown. Black (B) Tanpoint (T) Pepper (P) White (W) E?; K?; ?? E?; kk; aa E?; kk; A? ee; ??; ?? UPPERCASE = dominant alleles; lowercase = recessive alleles; ? = any allele at that locus (a) How would you describe the epistatic relationships of these three loci? Complete two statements below: Statement 1: " The dominant / recessive (pick one) allele at locus _______ is epistatic to the alleles at locus (or loci, if more than one) _______________." Statement 2: " The dominant / recessive (pick one) allele at locus _______ is epistatic to the alleles at locus (or loci, if more than one) _______________." (b) A pedigree was established from the intercrossing of two dogs. The letters under each dog symbol represent its fur coat variety (black = B; tanpoint = T; pepper = P and white = W). Determine dog 1's and dog 2's genotypes for all 3 loci. Use "?" for any ambiguous alleles. Genotype of Dog 1: Genotype of Dog 2:
Bryan V.
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