PreLecture 11 Genetic Analysis_Problem SolvingII_1to18 by UPAD

# Write out this cross

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Unformatted text preview: s of the parents of each cross?   a)    d/d u+/u+  x    d/d+ u/u  b)   d/d u+/u+  x    d+/d+ u/u  c)    d/d u+/u    x    d+/d u/u  d)   d/d u+/u    x    d+/d+ u/u   Problem‐solving skills  Several mutants of grasshoppers were found: first, a lazy jumper that jumped less frequently and not very far compared to wild-type grasshoppers and second a grasshopper that did not chirp. You want to determine something about the inheritance of these mutations. Why do we cross each of these mutants to wildtype first? Picture by Pearson Sco" Foresman, Wikimedia Commons   Problem‐solving CHALLENGE QUESTION!!  When the lazy jumper was crossed to a wildtype grasshopper: 79 wildtype and 81 lazy jumpers were produced. When two lazy jumpers were crossed to each other 40 wildtype and 80 lazy jumpers were produced. After 70 crosses between lazy jumpers some wildtype were always produced. Create a hypothesis to account for this result. Is lazy jumping dominant or recessive? Be sure to test your hypothesis! When the non-chirping grasshopper was crossed to wildtype the F1 were all wildtype but the F2 produced 119 wildtype chirping grasshoppers and 40 non-chirping grasshoppers. What do you conclude about non-chirping? If you cross a number of nonchirping females were crossed to a number of lazy jumper males what do you expect to see in the F1 and F2?  Problem‐solving CHALLENGE QUESTION  When a number of nonchirping females were crossed to a number of lazy jumper males in the F1 we obtained 800 chirping, normal jumpers and 800 chirping, lazy jumpers. To create the F2 the chirping lazy jumpers from the F1 were crossed. This is the F2 data: 300 chirping, normal jumpers 600 chirping, lazy jumpers 100 non chirping, normal jumpers 200 non-chirping lazy jumpers What do you conclude about the inheritance of chirping and jumping?  Problem‐solving CHALLENGE QUESTION  When a number of nonchirping females were crossed to a number of lazy jumper males in the F1 we obtained 800 chirping, normal jumpers and 800 chirping, lazy jumpers. To create the F2 the chirping lazy jumpers from the F1 were crossed. This is the F2 data: 300 chirping, no...
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## This document was uploaded on 03/01/2014.

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