220232001-LS420Mid22028KEY29

220232001-LS420Mid22028KEY29 - _ _ _Key_ Section id # name...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
___________________ _____________________ _________Key_______ Section id # name LS4 Midterm 2, Tuesday, February 20, 2001 SHOW ALL YOUR WORK FOR FULL CREDIT 1. (10 pts) Lemons are found in 3 shapes: round, oval and long. Pure breeding strains have been established for each shape and are used in the following crosses: Parentals F1 F2 Round x long All round 3/4 round 1/4 long Round x oval All round 3/4 round 1/4 oval Oval x long All oval 3/4 oval 1/4 long Using the results above, predict the outcomes of these crosses: Oval parent x F1 of round x long 1/2 round, 1/2 oval (S°S° x S R s) Long parent x F1 of round x oval 1/2 round, 1/2 oval (ss x S R S°) 2. (10 pts) You are studying the inheritance of two genes (A and B) in the pea plant. These genes have an identical function, giving the plant a purple flower. Only a plant that is homozygous recessive for both genes (aabb) has a white flower, any other combination of alleles (A_B_, A_bb or aaB_) gives a purple flowered plant. Genes A and B are linked and are 20 map units apart. For the following crosses, determine what % of the F2 progeny will have white flowers. (SHOW YOUR WORK) .4 .4 .1 .1 AAbb X aaBB Ab aB AB ab F1 (self cross) .4 Ab F2 .4 aB .1 AB aa The correct answer is ____1%____ .1 ab bb
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
3. (10 pts)
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 5

220232001-LS420Mid22028KEY29 - _ _ _Key_ Section id # name...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online