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.In a population of 150 chickens, produced from the same parents, how many chickens would you expect to have pigmented feathers?

Answer pls

Red–green color blindness is caused by an X-linked recessive genetic defect. Hence females rarely exhibit the red–green colorblind phenotype but may be carriers of the defective gene. When a narrow beam of red or green light is projected onto some areas of the retina of such a female carrier, she can readily diff erentiate the two colors, but on other areas she has diffi culty in doing so. Explain.

Based on the information shown in the chart above, what is the most likely inheritance pattern for the 'forked bristles' trait? why?

. Miniature wings (X") in Drosophila result from an X-linked allele that is recessive to the allele for long wings (X *). Give the genotypes of the parents in each of the following crosses. Male Female Male offspring Female offspring parent parent 231 long, 250 a. long long 560 long miniature 250 miniature b. miniature long 610 long 632 long 410 long, 417 miniature 412 long, 415 c. miniature long miniature 417 miniature 415 miniature d. long 761 long 630 long miniature 753 miniature e. long long 625 long

In c. elegans, genetics model organism, movement problems (unc) and small body size (sma) are encoded by two mutant alleles that are recessive to those that produce wild-type traits (unc+ and sma+). A worm homozygous for movement problems and small body is crossed with a worm homozygous for the wild-type traits. The F1 have normal movement and normal body size. The F1 are then crossed with worms that have movement problems and small body size in a testcross. The progeny of this testcross is: Normal movement, normal body size            210 Movement problems, normal body size          9 Normal movement, small body size                 11 Movement problems, small body size           193   a)From the test cross results, can you tell if the two genes are on the same chromosome or not? Explain your reasoning.   b)What phenotypic proportions would be expected if the genes for round eyes and white body were located on different chromosomes?  (please explain hot to get to these conclusions)

Predict the probability (using a Punnett square) of producing an offspring affected by a single gene X-linked mutation given the genotype of the parents. Compare these crosses in two cases: where the mutant allele is “A” vs where the mutant allele is “a” (XAXA x XaY) (XAXa x XAY) (XAXa x XaY) (XaXa x XAY) (XaXa x XaY). Include gender in the phenotype.

Fruit flies with the genotypes XghXgh and Xg+h+Y are crossed. Note that two X-linked loci are being evaluated, and the presence of a + indicates a dominant allele. The heterogametic offspring will... 1.all express a dominant g phenotype and recessive h phenotype. 2. all express both dominant phenotypes. 3. all express both recessive phenotypes. 4. all express a recessive g phenotype and a dominant h phenotype.

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.

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