4. Midterm 1 Version B Sect B answers (fill in blanks)

4. Midterm 1 Version B Sect B answers (fill in blanks) -...

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Unformatted text preview: Section
B:
Answer
the
following
by
filling
in
the
blank
with
the
appropriate
response.
 
 24. (2
 marks)
 Two
 individuals
 of
 genotype
 RRSSTTYY
 and
 rrssttyy
 are
 mated.
 The
 F1
 generation
 is
 interbred
 (self‐fertilized)
 to
 yield
 1500
 progeny.
 
 What
 proportion
 of
 the
 F2
 is
 expected
 to
 be
 RrSSTtYy?

__1/32_(this
question
asked
for
proportion,
which
is
a
fraction;
if
you
gave
the
absolute
 number
(47),
you
got
1
of
the
2
marks
available
for
this
question.)_______
 
 25. (1
mark)
The
 β‐globin
gene
has
many
alleles.

What
is
the
total
number
of
different
alleles
of
the
 β‐ globin
gene
that
could
be
carried
by
3
children
with
the
same
mom
&
dad.
__4__
 
 1. (1
 mark)
 Gerald
 and
 Lorna
 are
 both
 carriers
 of
 the
 autosomal
 recessive
 condition
 halitosis.
 If
 they
 have
 3
 children,
 what
 is
 that
 probability
 that
 two
 will
 be
 affected
 and
 one
 will
 not,
 regardless
 of
 order?
____(1/4)
(1/4)
(3/4)
+
(1/4)
(1/4)
(3/4)
+
(1/4)
(1/4)
(3/4)
=
9/64
 
 26. (1
mark)
A
frog
somatic
cell
contains
approximately
15
picograms
(pg)
of
DNA
in
the
G1
phase.

How
 any
picograms
of
DNA
are
expected
in
a
gamete
produced
by
this
individual?
___7.5_
pg
 ...
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This note was uploaded on 01/10/2010 for the course BIOLOGY biol2040 taught by Professor Tamarakelly during the Fall '09 term at York University.

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