Propose a hypotheses for this observation: In a study conducted by an undergraduate student, he obtained data showing that approximately 75% of the European Northern human population demonstrate the expression of a phenotype directly associated with the homozygous dominant genotype, while 25% display the mutant phenotype despite their genotypes being homozygous dominant.

In the nematode C. elegans, homozygosity for the e mutant allele causes an extreme "uncoordinated" phenotype, where the worm completely loses its ability to move. Examination of 100 individuals with genotype e/e reveals that 60 mutant worm can't move at all, 35 show a very reduced ability to move, and the remaining 5 seem to have a completely wild-type phenotype with respect to movement ability. These observations suggest that e has O incomplete penetrance and variable expressivity O low expressivity and variable penetrance Ohigh expressivity and variable penetrance O high penetrance and incomplete expressivity

Flower color variation in Phlox drummondii living either in sympatry or allopatry with Phlox cuspidata has previously been studied. Phlox drummondii exist in four colors: light blue, dark blue, light red, and dark red. Each flower color is controlled by a specific combination of alleles. In allopatry, butterflies randomly pollinate Phlox drummondii flowers of all color types. In contrast, non-random pollination occurs between differently colored flowers when both Phlox species are living in sympatry. The graph depicts the relative fitness of the alleles that drive flower color in Phlox drummondii under conditions of sympatry or allopatry with Phlox cuspidata. Label each half of the graph with the term sympatry or allopatry based on the observed trend in the relative fitness of the alleles that control all four flower colors in Phlox drummondii.

Given the following alleles that control the traits of Drosophila melanogaster:R = red eyes L = long wings B = brown bodyr = sepia eyes l = vestigial wings b = black body A testcross between a triple heterozygous parent and a recessive parent revealed the followingexpressed alleles: 55 sepia long brown 8 sepial long black187 sepia vestigial black 1 sepia vestigial brown43 red vestigial black 196 red long brown2 red long black 9 red vestigial brown Determine the order of the loci and the distance between them in centimorgan (cM). Construct agene map to show your results. Show COMPLETE solution.

Explain how natural selection might be responsible for the PTC taster polymorphism.Why might some populations have a higher frequency of the taster allele than others?

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

Epistasis refers to the interaction of genes wherein the expression of one gene is dependent on another gene. For example, suppose there are two genes that code for flower color in a plant, where red, WW or Ww, is typically dominant over expression of white, ww, and yellow, YY or Yy, is typically dominant over green, yy. One type of epistasis expresses a pattern where a dominant allele in either gene produces a red phenotype. Classify the F1 flower color ratio that would be produced from the dihybrid cross for each type of epistasis.

a)  To begin your analysis, state your null hypothesis.  b)  Perform a chi-square analysis. Make sure to analyze your traits to be consistent with the information provided. Clearly present your results in a table as shown in the attachement called Testing Genetics Ratios (Hint: should the traits be tested in males and females?)  c)  State the correct # of degrees of freedom, calculate the chi-square value and show the approximate p value.  d)  Make a statement of how the p value relates to whether you decided to reject or not reject, your null hypothesis.  e)  Finally, make a concluding statement about your original genetic hypothesis(es) based on chi-square analysis.  Fully typed, organized correctly, correct spelling, and grammar.  Genetic hypothesis for each allele: Trait: Leg length Hypothesis: The wild-type and mutant alleles for leg length are incomplete dominant relative to each other. Trait: Wing shape Hypothesis: There are two alleles for wing type, one dominant and one…

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)

In Labrador retrievers fur color is controlled by two genes. One gene controls pigment production with the dominant B allele producing a black pigmentation and the recessive b allele a brown pigmentation. The other gene controls the deposition of the pigment in the hair with the dominant E allele producing a functional transport system and the recessive e allele a nonfunctional transport system. Which of the following genotypes belongs to a true-breeding brown lab, i.e. a lab that produces nothing but brown offspring when bred with another lab of the same genotype?   Choose an answer below: B/b, e/e b/b, E/e b/b, e/e B/B, e/e none of the above