What is the Dominant Trait in Genetics?
-The Dominant Trait in genetics is the most powerful allele of them all. It has power over the recessive and bullies it all the time because its stupid.
-No matter what the case is if there is a dominant trait in the allele then it will be that trait 1000000000% of the time no questions asked.
Example: If I had a cross between a dominant blue worm and a recessive brown worm the offspring would all be Bb. The dominant trait of blue would overpower the brown making its offspring Blue.
How do you tell if something is dominant or recessive?
- When we talk about the dominant trait in a problem we are looking at the BIG BOY. He will always be the capital letter in the pair.
Example: If we had a dominant trait of red and a recessive trait of blue then the dominant would be RR for red and the recessive would be rr for blue.
-The first letter of the dominate trait (in this instance it would be red) is the only letter you use for the punnett square.
What if it is not stated in the problem?
- If the dominant trait is not stated in the problem it will always be the heterozygous parent.
Example: If I have a cross between a heterozygous green potato and a homozygous yellow potato then the dominant trait would be green (Gr)
Reflections:
- This unit on genetics by far was my favorite of all the units we have went over. Not only was it an easy topic but also interesting to learn about. Everything about us comes from these punnett squares and can tell us what our offspring may or may not look like. Its very mind blowing to me how something so small and simple can shown us what our children or other peoples children's could look like. You would think it would be something so hard and complex to solve and set up but its the exact opposite. These are some reasons on why I enjoyed this unit of biology.
Citations:
- Mr.Blacks powerpoints
- My brain
- http://www.backyardchickens.com/a/punnett-squares-easy-genetics
- http://study.com/academy/lesson/punnet-square-definition-example-quiz.html
- https://en.wikipedia.org/wiki/Punnett_square
What do you think about a society where we can decide exactly what our child will look like?
ReplyDeletedo you think there would be a time where everything is a dominant trait
ReplyDeleteDo you think it will ever be possible to over power a current dominate trait? Like blue eyes over ruling brown rather than the other way around.
ReplyDelete