Question

PLZ HELP 80PTS!!! What sex is the person who has the karyotype described in Steps 3-4? How do you know?

In what ways are the mutations described in Steps 5-6 and 7-8 different from those described in Steps 9-10 and 11-12?




In Steps 11-12, you saw that cystic fibrosis is caused when specific sections of both copies of chromosome 8 are deleted. On the basis of this information, do you think cystic fibrosis is a dominant or recessive trait?



Do all mutations result in negative effects?

Answer 1

I can’t help you with the first two questions, as I do not have a reference, but I can help you with the last two. Cystic fibrosis is a recessive trait. It is caused when specific sections of both copies of chromosome 8 are deleted, which in other words mean that it is not a sex-linked disorder because it isn’t inherited from the mother and father of the offspring.

No, all mutations are not bad. Only a small amount of mutations cause genetic disorder. Some in fact are good mutations. There is actually one mutation that is found roughly in 10% of Europeans which affects the CCR5 protein and it prevents HIV from entering the cell!