In a linkage mapping experiment, the following cross is performed: Pq/pQ x pq/pq. From this cross, the following progeny are observed: 430 Pq/pq 420 pQ/pq 30 PQ/pq 20 pq/pq What is the map distance between genes P and Q in map units?
Added by Pedro A.
Step 1
Step 1: Calculate the total number of progeny observed: 430 + 420 + 30 + 20 = 900 Show more…
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Genes Q, X, & W are all linked on the same chromosome. Dihybrid test crosses reveal that the map distance between Q & X is 8 mu, and the distance between Q & W is 6 mu. Draw two possible genetic maps for these three genes, indicating the map distances between the loci
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The map distance between genes $\mathrm{A}$ and $\mathrm{B}$ is 3 units, between $\mathrm{B}$ and $\mathrm{C}$ is 10 units and between $\mathrm{C}$ and $\mathrm{A}$ is 7 units. The order of the genes in a linkage map constructed on the above data would perhaps be (a) A, B, C (b) $\mathrm{A}, \mathrm{C}, \mathrm{B}$ (c) B, C, A (d) B, A, C
A geneticist mapping the genes $A, B, C, D,$ and $E$ makes two 3 -point testcrosses. The first cross of pure lines is $$A / A \cdot B / B \cdot C / C \cdot D / D \cdot E / E \times a / a \cdot b / b \cdot C / C \cdot d / d \cdot E / E$$ The geneticist crosses the $\mathrm{F}_{1}$ with a recessive tester and classifies the progeny by the gametic contribution of the $\mathrm{F}_{1}$ $$\begin{array}{lr}A \cdot B \cdot C \cdot D \cdot E & 316 \\a \cdot b \cdot C \cdot d \cdot E & 314 \\A \cdot B \cdot C \cdot d \cdot E & 31 \\a \cdot b \cdot C \cdot D \cdot E & 39 \\A \cdot b \cdot C \cdot d \cdot E & 130 \\a \cdot B \cdot C \cdot D \cdot E & 140 \\A \cdot b \cdot C \cdot D \cdot E & 17 \\a \cdot B \cdot C \cdot d \cdot E & \frac{13}{1000}\end{array}$$ The second cross of pure lines is $A / A \cdot B / B \cdot C / C \cdot D / D$ $E / E \times a / a \cdot B / B \cdot c / c \cdot D / D \cdot e / e$ The geneticist crosses the $\mathrm{F}_{1}$ from this cross with a recessive tester and obtains The geneticist also knows that genes $D$ and $E$ assort independently. a. Draw a map of these genes, showing distances in map units wherever possible. b. Is there any evidence of interference?
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