Assume that A and B are two linked genes on an autosome in Drosophila. A testcross is made where AB/ab flies are crossed to ab/ab flies and the progeny are counted and shown below. However, it is known that the Aa/bb genotype is lethal before the flies hatch and does not appear among the testcross progeny counted. What is the most precise map distance between the two genes that can be calculated from these data? Aa Bb = 235
Aa bb = 225
Aa Bb = 20
A) 4.2 m.u.
B) 4.0 m.u.
C) 16.4 m.u.
D) 8.0 m.u.
E) 50 m.u.
Correct Answer:
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Q7: Linked genes always exhibit:
A) phenotypes that are
Q8: Assume that an individual of AB/ab genotype
Q9: Linked genes:
A) assort randomly.
B) cannot cross over
Q10: You are studying two linked genes
Q11: Use the following to answer questions
You
Q13: Use the following to answer questions :
Dr.
Q14: Is it possible for two different genes
Q15: A genetic map shows which of the
Q16: Recombination frequencies can be calculated by:
A) counting
Q17: Crossing over occurs during:
A) late anaphase.
B) prophase.
C)
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