. Cell heredity. Cytogenetics. 88 CELL HEREDITY. FIGURE A chart showing the combinations of genes possible in the zygotes formed from a mating of individuals heterozygous for the same two nonallelic inde- pendently assorting genes. two can be made. As an example, we will consider a mating between two individuals simultaneously heterozygous for genes determining the ability to utilize the sugar, galactose, and determining eye color. These individuals have the genotype, Ala B/b. The four kinds of meiotic products would have the genetic compositions AB, Ah, aB, and ab. The possible results
. Cell heredity. Cytogenetics. 88 CELL HEREDITY. FIGURE A chart showing the combinations of genes possible in the zygotes formed from a mating of individuals heterozygous for the same two nonallelic inde- pendently assorting genes. two can be made. As an example, we will consider a mating between two individuals simultaneously heterozygous for genes determining the ability to utilize the sugar, galactose, and determining eye color. These individuals have the genotype, Ala B/b. The four kinds of meiotic products would have the genetic compositions AB, Ah, aB, and ab. The possible results of fertilizing eggs of these sorts at random with sperm of the same genotypes are shown in Figure It will be seen that a ratio of 9:3:3:1 is expected for the phenotypes brown-eyed, galactose utilizers; brown-eyed, galactose nonutilizers; blue-eyed, galac- tose utilizers; blue-eyed, galactose nonutilizers. The same result will be obtained by writing out the multiplica- tions implicit in the expression [{A-\-a) (B-\-b}]'^. For example, iA-ira){B + b} = AB + Ab + aB+ab; multiplying the latter term by itself gives the genotypes in the table. This method is convenient when. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Sager, Ruth; Ryan, Francis J. (Francis Joseph), 1916-. New York, Wiley
Size: 1672px × 1494px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcollectionbiodiv, bookpublishernewyorkwiley
