In fruit flies, gray is dominant over ebony body color and wild is dominant over curled wings.  A heterozygous gray, normal female is crossed with an ebony, curled male and the following results were obtained:                         gray, normal        98                         gray, curled       106                         ebony, normal   101                         ebony, curled      97             Based on these data, are these two loci linked? Fully explain your answer.

The rate of crossing over between two linked genes (r and w) is 0.44. The following cross is carried out: Rr Ww × rr ww. What proportion of the gametes of the Rr Ww parent were recombinant gametes? Explain your reasoning and state any assumptions you made.

Fruit color in eggplants is controlled by a single autosomal gene, R, with two alleles R and r When a homozygous plant that produces purple fruit (RR) is crossed with a homozygous plant that produces white fruit (rr), all F1 offspring produce violet eggplants. When the F1 progeny are testcrossed, the F2 progeny produce 160 violet eggplants, and 154 white eggplants. Design a hypothesis for the mode of inheritance of eggplant color (explicitly state your null and alternate hypotheses). Test this hypothesis using a chi-squared test. Use the chi-squared critical value table provided to determine the outcome of your statistical test. Explain the results obtained (i.e. interpret the p-value).

A cross between fruit files with genotypes Aa Bb × aa bb produces the following progeny: 10 Aa Bb 40 Aa bb 40 aa Bb 10 aa bb Were the parental alleles in the coupling or repulsion configuration? Briefly explain

We are interested in detremining the genetic map of three different house finch traits: beak color (dark vs light), song length (short vs long) and patch size (reduced vs normal). We have done a large experiment involving the usual PO crossed, with the F1 test crossed. The following are the data for the offspring from the test cross: Beak Shade Patch Size Song Length Number Observed Dark Normal Long 67 Light Normal Long 3 Light Normal Short 498 Dark Normal Short 43 Dark Reduced Short 13 Light Reduced Short 80 Light Reduced Long 50 Dark Reduced Long 389 Choose the map below that best fits the data Beak Shade- 14.26CM- Patch Size- 9.54CM-Song Length O Patch Size-9.54cM- Beak Shade- 14.26CM-Song Length O Patch Size- 14.26cM- Beak Shade- 9.54CM-Song Length O Beak Shade-9.54cM-Patch Size- 14.26CM-Song Length O Patch Size-9.54CM- Song Length- 14.26CM-Beak Shade O Patch Size- 14.26cM-Song Length- 9.54cM-Beak Shade

The following results were obtained from a dihybrid cross between two pea plants:   315 plants with round seeds and yellow flowers 101 plants with wrinkled seeds and yellow flowers 108 plants with round seeds and white flowers 32 plants with wrinkled seeds and white flowers   Assume that round seeds and yellow flowers are dominant and both parent plants were heterozygous for both traits.

In the red spotted butterfly there are two traits under investigation.  The wing margin can be either notched (N) or straight (n) and the wing color can be either pale yellow (b) or bright yellow (B).  A bright yellow male with straight wing margins was crossed with a bright yellow female with notched wing margins.  All of the resulting progeny had notched wings and both color patterns were present.  From these data determine the genotypes of the butterflies used in the original cross.

A presumed dihybrid in Drosophila, BbFf is testcrossed with bbff. (B-black body, b-brown body, F-forked bristles, f-unforked bristles) The results for the testcross are below: Black, forked: 230  Black, unforked: 210 Brown, forked: 240 Brown, unforked: 250 Determine the expected values and ratios for each genotype.