Retrievers Assorted

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Posted by admin | Posted in Dog Supplies | Posted on 31-07-2010

I need help doing this genetic problem ... HELP?

Two distinct loci independently interact to exert major influence in skin color in some varieties of dogs, like Labrador Retrievers. The alleles at locus B determines the amount of melanin deposited in the nets of the skin. The dominant allele, B, results in the deposition of black pigment to produce more skin, while expression the recessive allele, b, leads to deposition of pigment to produce less brown (chocolate) leather. At the place where the allele dominant I, inhibits melanin deposition and results in the skin yellow or white, while the expression of its recessive counterpart, i, can melanin file normally. Determine the phenotypic ratio of offspring produced by mating two dogs phenotypically white, each heterozygous both loci.

Father: BbIi Dam: BbIi Lord can give the following combinations of alleles: BI, bisexual, bi, bi dam can donate combinations following alleles: BI, bisexual, bi, bi Therefore, the Punnett square looks like this: Bi Bi Bi Bi Bi Bi Bi Bi You fill in the rest of the place, enforcement of each allele down and across. You get the following genotypes and phenotypes: BBII BbIi-yellow and yellow-yellow and yellow BBIi BbIi BbII bbii-chocolate-yellow-black-yellow Bbii bbIi BBIi Bbii yellow-black-black-yellow BBii BbIi bbIi BbII yellow yellow yellow yellow bbII BbIi then all blacks are added and divided by 16, then add all chocolate and divide by 16, then add all the yellow and divide by 16 and their relationship phenotype.