GENETICS QUESTION!!! 1. Expression of a newly cloned gene is examined using a la

Question

GENETICS QUESTION!!!

1. Expression of a newly cloned gene is examined using a lacZ reporter fused to the gene's promoter. lacZ expression is seen in a broad band located at the approximate center of the anterior-posterior axis. What class of Drosophila developmental regulatory gene most likely corresponds to the newly cloned gene?

A. coordinate genes

B. gap genes

C. pair rule genes

D. segment polarity genes

E. homeotic genes

2. The five chromosomes diagrammed below (a - e) are evolutionarily related. The most recent version of this chromosome is (a). What is the evolutionary relationship between (a) and the other chromosomes? List the chromosomes in order of origin, starting with the most recent and finishing with the oldest.

(a) AD•CGFGFEH

(b) AD•CEFGH

(c) ABC•DEFGH

(d) AD•CBEFGH

(e) AD•CGFEH

A. a - b - c - d - e

B. a -c -d - e - b

C. a - e - b - d - c

D. a - c - d - b - e

E. none of the above

A. coordinate genes

B. gap genes

C. pair rule genes

D. segment polarity genes

E. homeotic genes

Explanation / Answer

Relationship of chromosome a) with other chromosomes:

p) with chromosome e), it is related by duplication of GF genes

q) with chromosome b), an inversion of EFG segment followed by a duplication of GF segment.

r) with chromosome d), a deletion of B gene, inversion of EFG segment and then duplication of GF

s) with chromosome e), inversion of BCD segment, deletion of B-gene, inversion of segment EFG and then duplication of GF segment.

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