4, Multiple alleles Mendel\'s work suggested that just two alleles existed for e

Question

4, Multiple alleles Mendel's work suggested that just two alleles existed for each gene. Today, we know that's not always, or even usually, the case! Although individual humans (and all diploid organisms) can only have two alleles for a given gene, multiple alleles may exist in a population level, and different individuals in the population may have different pairs of these alleles. As an example, let's consider a gene that specifies coat color in rabbits, called the C gene. The C gene comes in four common alleles: C, ch ch, c A CC rabbit has black or brown fur A ch cch rabbit has chinchilla coloration (grayish fur). A ch ch rabbit has Himalayan (color-point patterning, with a white body and dark ears, face, feet, and tail A cc rabbit is albino, with a pure white coat. Phenotype Image credit: "Characteristics and traits Figure 5," by OpenStax College, Biology (CC BY 3.0).

Explanation / Answer

C is dominant, wild and colored. c is recessive albino. The dominance is in the order of..............C----->Cch------>Ch------->c C allele produces an enzyme precursor for coat color and Cch incompletely dominates C. Homozygous CC has two dominant alleles which express the dark black color. CCch is light dark colored, here the presence of dominant allele C responsible for incomplete dominance. Cchch is light gray in color, here Cch is responsible for light color, here Cch is dominant over Ch. Chc is albino except at ear tips, nose, paws and tail, Ch allele has been responsible for coloration at certain points. Ch is dominant over c and shows color only at ear tips, nose, paws and tail. cc is homozygous recessive and completely turns off the color, presence of two cc genes completely eliminates the expression of color. Thus within heterozygous genes, the dominant allele overexpresses subsidizing the effect of recessive allele. Because of the presence of multiple alleles for coat color in rabbits, several phenotypes could be observed. possible genogypes possible phenotypes CC,CCh, Cc agouti, black , dominant CCch black and light gray blending, incomplete dominance cchcch chinchilla cchch,cchc light gray,dominant over himalayan and albino chch,chc himalayan, color at certain points,dominance over c (albino) cc albino, white, recessive

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