In rabbits, an allelic series helps to determine coat color: C (full color), cch (chinchilla, gray color), ch (Himalayan, white with black extremities), and c (albino, all-white). The C allele is dominant over all others, cch is dominant over ch and c, ch is dominant over c, and c is recessive to all the other alleles. This dominance hierarchy can be summarized as C > cch > ch > c. The rabbits in the following list are crossed and produce the progeny shown. Give the genotypes of the parents for following cross: Phenotypes of parents       Phenotypes of offspring Q. Himalayan × albino       12 Himalayan, 12 albino

Incomplete Dominance and Codominance So far, we have been studying the inheritance of genes that show complete dominance. In other words, one allele is completely dominant over another. In some cases, such as incomplete dominance and codominance, one allele is not completely dominant over another or the alleles affect the phenotype equally. Examples of incomplete dominance include feather color in parrots (C*C* = blue, C'C = yellow, C*Cf = green) and hair texture in humans CC = curly; C'C' = straight; CC' = wavy Practice Problem 3: За. If a straight-haired man marries a curly haired woman, what are the predicted genotypes and phenotypes of their children? If a parrot with yellow feathers is crossed with a parrot with green feathers, what are the predicted genotypes and phenotypes of their offspring? 3b.

Human blood type is regulated by 3 alleles (A,B,O). Four blood types are possible: A, B, AB, and O.  A woman who has blood type A has a son with blood type O. She sues Man #1, whom she claims to be the father, for child support.  Man #1 suspects he is not the only paternal candidate and requests blood-typing for Man #2. Based on the blood-typing results in the table below who could be the father? Man #1: Type B Man #2: Type O Man #1 only Man #2 only Man #1 or Man #2 Impossible for either, since the Mother has blood type A

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?

There may be a number of possible alleles for a given gene within a population. In a multiple allele system the dominance relationships between the various alleles must be considered. One of the more familiar examples of a multiple allelic system is that of the human ABO blood group. The gene involved codes for a protein located on the outside of red blood cell membranes. Three alleles (IA, IB and i) determine whether the protein is present or absent and which form of the protein (if any) is present. The A and B alleles code for the A and B forms of the protein and are co-dominant with each other. The O allele (i) codes for no protein and is recessive to both A and B alleles. This means there are four possible phenotypes (blood types: A, B, AB, and O). This also means there are 6 possible genotypes: IAIA, IBIB, IAi, IBi, IAIB and ii.  If you have the letter ‘O’ anywhere in any of your genotypes, you are doing it wrong.   4- Show the possible genotypes and phenotypes of the offspring…

Curly hair is due to a dominant allele in humans. Straight hair is a recessice allele. the heterozygous condition produces wavy hair, a. phenotype that appears as a blend of the two alleles. This is an example of which of the following patterns of inheritance.   a) Simple dominant b) Sex linkage C) Multiple allele d)Incomplete dominance

If a B is a dominant allele that codes for a trait where the bearer of this allele has a black coat, and b is a recessive allele where the bearer has a brown coat, the recessive genotype will exhibit the phenotype of brown coat, the genotype will have the black coat phenotype, and the dominant genotype will have the black coat phenotype. (Use either heterozygous or homozygous in the blanks.)