General Genetic Principles
11 - 20 of 106 Answers
March 23, 2016:
If a woman has two X chromosomes, how do we know which X chromosome each of her offspring has? She received one X from her mother and one X from her father. Will her offspring receive the X from her mother or the X from her father? Is there a 50/50 chance of either? Or does it depend upon the offspring's sex- i.e. females receive X chromosome donated from grandmother, males receive X chromosome donated from grandfather? Do we know for sure?
October 1, 2015:
Why don’t silent mutations cause problems? What makes them silent?
June 16, 2015:
I know that crossing over can happen along chromosomes, but can crossing over happen inside genes themselves? It seems from what I have read that it can’t.
May 27, 2015:
Why is it that some traits show as codominant, but others show as incomplete dominant?
April 29, 2015:
I am a female carrier of a red/green colorblind gene and have read that there is a probability of 1/2 of having an affected son if the father has normal vision. I have four sons and all four are red/green colorblind. Why don’t two have normal vision?
January 28, 2015:
I learned in class that chromosomes get shorter every time a cell divides and that most cancers get around this with something called telomerase. How does telomerase work and how do cancers that don't use telomerase keep dividing?
October 30, 2014:
I have learned about codominance, but are there some codominant traits in humans? For example, do some humans have one blue eye and one green eye, or are these traits just incomplete dominance?
October 1, 2014:
My mother is A blood group, my father is O blood group and I'm O blood group. I thought that my mother’s A blood group would always dominate my father’s O blood group, so I would have to be an A blood group. Could you let me know if this is the case please?
August 19, 2014:
I read on your site that a recessive trait is often the result of a broken gene. I can’t seem to figure out why a broken gene would lead to the green peas in Mendel’s famous experiment. Do they know why yellow is dominant over green?
July 16, 2014:
If I have one child that is homozygous for A1298C and the other child is homozygous for C677T. Are my husband and I both compound heterozygotes for sure? Or, is it possible to be both homozygous for one mutation and either heterozygous or homozygous for the other?