Chap13 Lecture 16 and 17:
Practice with solved problems on page 448
Practice with problems on pages 450, #4
answers:
Z
no lactose, lactose / no lactose, lactose
Y
a= ++/-b= ++/++
c= --/-d= --/-e= ++/++
f= -+/-g-+/-+
and:
Would the following genotypes for the E. coli lac
operon be non-inducible
(non-ind), inducible (ind), or constitutive (con) for
beta-galactosidase
production?
(a)
(b)
(c)
(d)
(e)
(f)
I-P+O+ZI+P+OCZI-P+O+Z-/I+P+O+Z+
I+P+OCZ-/I+P+O+Z+
ISP+O+Z+
I+P-O+Z+
Answer: (a) non-ind (b) non-ind (c) ind (d) ind (e)
non-ind (f) non-ind
If willing, students can go on and try to solve the
challenging problem 12
on page 450 (no answer provided here).
--------------------------------------Chap 16 lectures 18 and 19
Practice with solved problems on page 548
Chap 16, Lectures 18-19: problems
- Which of the following karyotypes provide evidence that somatic sex determination
mechanisms are different in Drosophila and mammals?
T F (a) XX
T F (b) XXY
T F (c) XY
T F (d) XO
T F (e) Individuals with a mixture of XX and XY cells
Answer: (a) False; (b) True; (c) False; (d) True; (e) True
- Based on the characteristics of the following Drosophila developmental mutants, assign
each of the mutant genes to one of the following categories: homeotic gene,
maternal-effect gene, or segmentation gene.
Mutant strain
#1 Homozygous females are normal but
produce larvae that have a head
at each end and no posterior ends.
#2 Affected flies have wings growing
out of their heads in place of eyes.
Homeotic
Maternal Effect
Segmentation
#3 Homozygotes have shortened thoracic
regions, a normal number of abdominal
segments, but lack the second and third
pair of legs.
Homeotic
Maternal Effect
Segmentation
#4 The antennapedia mutant
Homeotic
Maternal Effect
Segmentation
Answer:
#1: Maternal Effect
#2: Homeotic
#3: Segmentation
#4: Homeotic
-
Type of gene?
(Circle the best answer)
Homeotic
Maternal Effect
Segmentation