BRUS!
Do
the SQUARE! (but backwards)
If I
have about 150 grey flies and about 50 black flies… That’s a 3:1
ratio!
A
3:1 ratio would result from a crossing of two heterozygous grey flies… Gg
X Gg
|
|
G |
g |
|
G |
GG |
Gg |
|
g |
Gg |
gg |
Thanks for the question!
MUGAN
From: Sigrid
Brus [mailto:wsr_panda5@msn.com]
Sent: Monday, January 04, 2010 9:54
PM
To:
Subject: Brus, Sigrid 1st
Bio
I was taking one of the tests and
I got the following question wrong. Could you explain why my thinking is
wrong?:
In the fruit fly, gray body (G) is
dominant over black body (g). Two gray flies were mated. 158 gray bodied flies
and 49 black bodied flies were produced. The parents probably
were: