Pigment of chicken feathers is regulated by two genes, the gene for feather pigment C, and a gene that inhibits pigment production, I. A mother chicken, who is homozygous dominant for gene C, and heterozygous for gene I, is crossed with a father chicken, who is heterozygous for the pigment gene, and heterozygous for gene I.Inhibition is dominant to uninhibited, pigmented feathers are dominant to unpigmented feathers.What is the probability of one of the offspring of these two chickens having white feathers? (percentage)

In mice, coat color is due to the inheritance of three genes located on three different chromosomes.  The A gene which determine if a yellow band is present on the hair     ( A_= yellow band, aa= no yellow band ) and the B gene which determines if the hair is brown ( bb ) or Black ( B_).  The A and B genes interact to produce the following coat colors: Agouti:     A_B_ Cinnamon:  A_bb black:       aaB_ brown      aabb The third gene is the C gene, which determines if the mice has any hair pigment at all.  If the mouse has at least one C allele then the coat color will be determined by the A and B genes as described above.  However, if the mouse is cc in genotype it will be albino, regardless of the mouse’s A and B genotype. 1.If a AabbCc mouse mates with a aaBbcc mouse, what is the probability that the mouse will be born brown? (a) ½    (b) ¼  (c) 1/8   (d) 1/16   (e) none of the above

Fruit flies with the genotypes Xg+h+Xgh and XghY are crossed. Note that two X-linked loci are being evaluated, and the presence of a + indicates a dominant allele. The homogametic offspring will.... 1. express either the dominant or the recessive phenotypes for both g and h. 2. all express both dominant phenotypes. 3. express neither phenotype. 4. all express both recessive phenotypes.

Cats are hairless when homozygous recessive (hh) for the Hairless gene. Cats have straight hair when recessive for the curly gene (cc). The H gene determines whether hair can be produced, and the C gene determines whether the hair is curly. These genes work in an epistatic pathway, with H/h first, then C/c. You cross a straight-haired cat to a hairless cat with genotype CChh, and find that all of the F1 kittens have curly hair.

Which of the following statements about calico cats is true? Select all that apply.

#1b) An allele for coat color in mice, Y, produces a yellow coat color when present. The phenotypes of the F1 generation are shown. A cross between a Non-yellow mouse and yellow mouse produces half yellow and half non-yellow progeny (offsprings). Non-yellow happens to be white in this example, but it does not need to be; it can be black, grey, or some other mouse color. How does the F1 generation ratio differ from the expected mendelian ratios for a heterozygous, hybrid cross? * Yellow Non-yellow Pgeneration Yellow Yellow Meiosis Gametes 1/2 1/2 Fertilization Yellow Non-yellow F generation Non vellow Yellow Yellow Dead Support | Schoology Blog | PRIVACY POLICY | Terms of Use

What are Possible Dominance Relations in case of hypomorphic mutations?

Dr. P was using Drosophila to follow the inheritance patterns of two traits: body shape and wing size. Dr.P began her experiment by crossing wild type, homozygous dominant, males with double mutant, homozygous recessive, females. She then performed a testcross by mating Fi generation males with double mutant, homozygous recessive, females and observed the phenotypes of the F2 generation. Shorthand of the different alleles is annotated as follows: Wild type round body shape allele = b* Wild type large wing size =w* Mutant rectangle body shape allele = b Mutant small wing size = w A) Complete the table by indicating the genotypes for each generation of male and female flies. Male Genotype Female Genotype P generation F, generation testcross When Dr.P characterized and counted the F2 phenotypes, she determined the following: Round-large Rectangle-small 332 flies Round-small Rectangle-large 357 flies Number of flies 344 flies 360 flies B) Using the data above, would you be surprised (yes…