The B allele confers black coat color and the b allele brown coat color in Labrador dogs. When another gene, E, is inherited, the coat is golden no matter what the B phenotype is. A dog of genotype ee expresses the black phenotype. What unusual phenomenon is at work in this disorder?

In a cross between Aa Bb XCDXCD and Aa Bb XCDY, the A gene controls earwax- where wet earwax is dominant to dry earwax. The B gene controls the ability to taste the bitter compound PTC. Tasting is dominant to non-tasting. A and B are found on different autosomal chromosomes. The C gene controls color vision- color vision is dominant to color blindness. And the D gene controls production of dystrophin, the gene disrupted in Duchene's Muscular Dystrophy. Individuals who have two copies of the recessive d allele or are hemizygous for the recessive d allele have muscular dystrophy. The parents have a child. What is the probability that child has wet earwax, can taste PTC, can see color, and has DMD? When the parents have 5 children. What is the probability that 4 of them are tasters, 1 of them is a non-taster, and all of them have wet earwax?

For a particular gene, homozygous dominant AA and heterozygous Aa individuals produce green pigment, while homozygous recessive aa individuals produce yellow pigment. During the course of your research you discover the a1 allele that contains a class IlI transposon insertion. Allele A is dominant to a1. Which genotype is capable of producing a mixture of green and yellow pigment?

Pigment produced in cells which are located at the base of growing hairs is packedinto granules which are then transferred to the growing hair shaft. The gene controllingthis transfer of pigment granules to growing hair has the alternative allelesD : uniform distribution of pigment granules in hair ---- intense colourd : uneven distribution of pigment granules in hair -------dilute colourThe colour of cats homozygous dd, is diluted as shown below non dilute   dilute black dd blue brown dd lavender orange dd cream The colour of cats either DD or Dd is intense, or non-dilute. Note that alternativenames for colours are sometimes used. Seal for black, grey for blue, chocolate forbrown, lilac for lavender and red or yellow for orange. Genetically, there is nodifference between the particular alternatives.Examine poster 4 – cats. a. What is the genotype, with respect to the ‘B’ and ‘D’ loci of blue point kitten, lavender point kitten and brown point kittenb. What is the genotype…

In cattle, Horned (H) is completely dominant over the hornless (h) condition. A horned bull is bred to two cows. With cow A, which is hornless, a horned calf is produced. With cow B, also hornless, a hornless calf is produced. What are the genotypes of the bull and the two cows?