| View previous topic :: View next topic |
| Author |
Message |
JerryWTu7580
Joined: 15 Jan 2009
Posts: 7
|
 Posted: Sat Jan 24, 2009 9:40 pm Post subject: Question 28 |
 |
|
If traits A & B are recessive, and as the answer states (1) is heterozygous for B and (2) is heterozygous for A, then...
(1) = aaBb
(2) = Aabb
How would (7) be able to acquire 2 dominant alleles? Isn't it necessary for (7) to get A from (2) and a from (1)... and B from (1) and b from (2)? |
|
| Back to top |
|
 |
jellywing_2058
Joined: 04 May 2009
Posts: 179
|
| Posted: Wed May 27, 2009 9:56 am Post subject: #28 |
|
|
Yes, there must be a dominant and a recessive allele for both genes A and B.
Also, according to the diagram, you can conclude that trait C is recessive (female #16 is the only one affected).
Therefore, all other members (including member #7) are heterozygous (Cc) or homozygous dominant (CC) for the trait C i.e. it is possible that organism 7 has two dominant alleles (only at the C locus though) and this is why option III cannot be inferred; leaving answer choice A as the right answer. |
|
| Back to top |
|
|
admin
Site Admin
Joined: 08 Dec 2003
Posts: 2176
|
| Posted: Thu Jul 30, 2009 3:28 pm Post subject: |
|
|
| bump |
|
| Back to top |
|
|
|
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
