For today's class, we refreshed our memories first by reviewing incomplete dominance, codominance and sex-linked genteics problems. We paired up in groups and went over several questions on the handouts that Mr. Quick gave us before the break. Then, we learnt a new concept about how to be Sherlock Holmes --- Pedigree. We learnt how to analyse a pedigree diagram, and how to determine whether the genetic problem is sex-linked or autosomal. In order to identify the genetic problem (it's sex-linked or autosomal), we always need to work backwards and detect the details on the diagram.
 |
| Pedigree Symbols! Important! |
* For sex-linked problems, usually males have a higher chance of having it then females do.
(males > females)
* Autosomal means, all chromosomes except 23 [ NOT xx, xy]
Once we determine whether the genetic problem is sex-linked or autosomal, we then need to determine whether it is dominant or recessive. To determine whether it is recessive or dominant, we need to calculate the percentage. For autosomal, if the percentage is higher than 25%, then it is dominant. If the percentage is lower than 25%, then it is recessive. However, I am not sure about how to determine the recessive and dominant part for sex-linked genetics problems. I need to work on that part.
No comments:
Post a Comment