Posted by:
toddbecker
at Tue Aug 19 13:00:24 2008 [ Email Message ] [ Show All Posts by toddbecker ]
The basic mistake you are making is that you are not representing both genes for the appropriate allel for each trait. You need to represent both parents respective genes. even though one of the parents are normal since we are looking at breeding it with a morph then the normal animal still needs to represent the given morph(s) that we are talking about. It is traditional to represent a morph with lower case letters and without trait as a capital letter for example a bumblebee needs to be written like PpSs. With the Pp representing that it carries one gene for the pastel morph and the Ss representing the same thing for the spider morph. The normal that it is still being bred to will also have to represent all the same genes but since it it not a carrier for any of them then it will be all capital letters, PPSS.when you are dealing with two seperate morphs your punnet square will double in size to 16 blocks and when labeling you need to represent all four possible combination of genes that they can provide to the offspring. The bumblebee should look something like this:
PS Ps pS ps
PS
PS
PS
PS
The normal has no choice but to give normal genes but the bumblebee has four different possible combinations. So this being said the whole punnet square should look something like this:
PS Ps pS ps
PS PPSS PPSs PpSS PpSs
PS PPSS PPSs PPSS PpSs
PS PPSS PPSs PpSS PpSs
PS PPSS PPSs PpSS PpSs.
Remembering that the capital letters represent without trait (normal) and the lower case represents with trait then we can determine that you have a 25% chance per egg of either normal, spiders, pastels or even bumblebee. I know this is long but i hope it breaks it down for you a little easier, Todd
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RE: This is what is confusing me... - toddbecker, Tue Aug 19 13:00:24 2008