Mode of inheritance

Labrador retrievers may be black, brown, or golden in color. While each color may breed true, many different outcomes occur if numerous litters are examined from a variety of matings, where the parents are not necessarily true-breeding. The results below show some of the possibilities. Propose a mode of inheritance that consistent with these data, and indicate the corresponding genotypes of parents in each mating. Indicate as well the genotypes of the dogs that breed true for each color. A: black x brown = all black B: black x brown = ½ black, ½ brown C: black x brown = ¾ black, ¼ golden D: black x golden = all black E: black x golden = 4/8 golden, 3/8 black, 1/8 brown F: black x golde... click for more

Genetics: Blood Groups

Five human matings numbered 1-5 are shown in the following table. Include both maternal and paternal phenotypes for ABO, MN, and Rh blood-group antigen status (Rh+ is the dominant trait): Parental phenotypes 1. A, M, Rh- x A, N, Rh- 2. B, M, Rh- x B, M, Rh+ 3. O, N, Rh+ x B, N, Rh+ 4. AB, M, Rh+ x O, N, Rh+ 5. AB, MN, Rh- x AB, MN, Rh- Offspring a) A, N, Rh- b) O, N, Rh+ c) O, MN, Rh- d) B, M, Rh+ e) B, MN, Rh+ Each mating results in one of the five offspring shown to the right (a-e). match each offspring with one correct set of parents, using each parental set only once. Is there more than one set of correct answers.

Recombinant classes, genotypes and linkage arrangements

I need help with the following problem set. Please give a detailed set of answers to better assist me with understanding the genetic concepts. Dihybrid test crosses are made between each pairwise combination of the three genes C, D, and E with the following results: CD: 222 CE: 48 DE: 198 Cd: 280 Ce: 455 De: 289 cD: 280 cE: 445 dE: 311 cd: 218 ce: 52 de: 202 ___________________________ 1000 1000 1000 total 15. Which are the recombinant classes in these three crosses? 16. Give the genotypes of the dihybrids in these three crosses, showing linkage arrangements. 17. Draw the map for thes... click for more

Genetics

Genetics technology is used to identify species variations. The Phylogenetic Species Concept states that species are "minimally diagnosable clusters of individuals . . . which may or may not be reproductively isolated". One problem with this concept is that subspecies are not recognized. Where do we draw the line between subspecies and species? What is a species? What is a subspecies? What problems arise when defining a species?

Modification of Mendelian Rations

In pings, coat color may be sandy, red, or white. A geneticist spent several years mating true-breeding pigs of all different color combinations, even going so far as to obtain true-breeding lines from different parts of the country. For crosses 1 and 4 below, she encountered a major problem: her computer crashed and she lost the F2 data. She nevertheless persevered, and using the limited data shown here, she was able to predict the mode of inheritance, the number of genes involved, and assign genotypes to each coat color. Based on the available data generated from the crosses shown, attempt to duplicate her analysis. Cross P1 F1 ... click for more