A mutation in the gene "tan" in fruit flies results in a lack of pigmentation. The same mutation also negatively impacts vision in flies, and also alters the pheromones produced by the flies. Based on this information, this mutation can be called ...     epistatic   pleiotropic   partially penetrant   co-dominant   All of the above

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)

Shown here is PCR-based analysis of mouse pups from an experiment designed to evaluate the phenotypic impact of the sex-reversed Y chromosome gene (SRY). Interpret the data shown here clearly, defining the importance of each mouse tested and interpreting the results. Which mouse (of the three shown) is likely transgenic for Sry? Explain.

Explain this to me…..

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.

Which of the following statements is TRUE? Overexpression of the X-chromosome in the somatic cells of males a. leads to the formation of a Barr body in male cells' nuclei. b. leads to cellular mosaicism in males hemizygous for an X-linked gene. c. is characteristic of all XY systems of sex determination. d. is the mechanism in flies to compensate for the higher dosage of X-linked genes in females as compared to males. e. None of the above

There is a gene in sand sharks that determines whether or not there is an anal fin. If a male sand shark is heterozygous for the presence of an anal fin (he is Aa), what are the possible sperm genotypes he can produce?       his sperm cells will carry either an A or an a   his sperm cells will carry either AA, Aa, or aa   half his sperms will carry AA and half will carry aa   None of the above