Inheritance And Probability Page 7
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1
2
3
4
5
6
7YES
NO
A
R
NALYZE YOUR
ESULTS
A) Remember your hypothesis:
H
,
OWEVER
If I cross 2 mice that each carry 1 gene for black eyes
For each of the three genetic
and 1 gene for
red
eyes
(Bb
X Bb),
crosses (trials) you conducted,
then I expect to get:
your
actual results
may or may
not have supported your
___1____ black eyed mice with
BB
genes
hypothesis
that the
offspring
___2____ black eyed mice with
Bb
genes
would be 1
BB
(black eyes), 2
___1____
red
eyed mice with
bb
genes
Bb
(black eyes), 1
bb
(red
eyes).
___4___ = total number of offspring
B)
Conducting more trials and collecting more data often results in a better fit between the
actual
experimental results and the
predicted
results (hypothesis). Next you will analyze all of your data
and determine how well your actual results support your hypothesis by summarizing the results of
the 3 genetic crosses you and your partner conducted during T
1, 2 & 3.
RIALS
1. In the chart below, enter the actual number of each gene combination you obtained for each
cross/trial (look back at pages 2 & 3 for the results of each cross/trial.)
2. Then, going across the chart, add up all the BBs from all three trials and enter the answer in
the “Total number from all crosses” box. Do the same for the Bbs and bbs.
Trial 1
Trial 2
Trial 3
Total number
Expected # based
st
nd
rd
on hypothesis
1
cross
2
cross
3
cross
from all crosses
+
=
3
+
BB
+
=
+
Bb
6
+
=
+
bb
3
3. Now that you’ve looked at a larger number of offspring (12 offspring for T
1, 2 & 3
RIALS
instead of just 4 for one trial), do the total results of your
3 actual
crosses come closer to
your predicted hypothesis?
YES
NO
C) C
OMBINE YOUR DATA WITH THAT OF YOUR ENTIRE CLASS
What results would you expect if you examined the offspring produced in the genetic crosses
from your entire class? First add up the total number of BB, Bb, and
bb
offspring produced by
everyone in your class. Determine the “Expected # based on hypothesis” using the total number
of offspring produced by all the crosses/trials by everyone.
Total offspring
BB
Bb
bb
(all crosses)
+
+
=
Total number for entire class
________
________
________
________
Expected # based on hypothesis
________
________
________
When you have an even larger number of offspring (all the
actual results
from your entire
class), do the results come closer to matching your
predicted
hypothesis?
YES
NO
genetics data sheet 17 Dec. 03
4
Savannah River Ecology Laboratory [
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