Question

In order for an inherited genetic mutation to result in a phenotypic change for a recessive trait, which of the following must occur?

The mutation must be inherited from the father.

The mutation must be inherited from the mother.

The mutation must be inherited on the x chromosome.

The mutation must be inherited by both parents.

Answer 1

recessive traits must have both copies in order to express--so, that meas that in order to have a phenotypic change:
The mutation must be inherited from both parents

so, id go with the last option, even though it doesnt seem entirely correct to me (they used inherited by, which to mean means the parents got the mutation)

Answer 2

gracias^.^ <3

Answer 3

de nada

Answer 4

i have one more question if you dont mind ?

Answer 5

I think agreene is right about the fact that a mutation on a somatic chromosome must be inherited by both parents if the offspring develops the phenotype. The offspring must inherit both mutant alleles - one from each parent. However if the condition is X -linked then only one mutant allele is required for the male offspring to show the phenotype. Sorry to confuse matters but you should know what the situation is properly. If you look at X-linked colour blindness or hemophilia then you'll see waht I mean.

Answer 6

lol thanks^.^ and can you check out the recent question i have posted? im having trouble.

Answer 7

Sure - the gene associated with CF is on chromosome 7, rather than on a sex chromosome. This means that the condition will arise if the father is also a carrier of the disease (or has both recessive alleles and has CF). One in four offspring would get CF if two carriers were parents whereas three out of four would have the disease if someone with CF and someone who carried the disease had offspring.

Answer 8

so the answer is A

Answer 9

what @ebaxter01 is saying is that if the mutation is on the X chromosome of the sex-linked pair, then it must come from the mother because the father only contributes a Y chromosome. But, generally your answer will be the poorly worded D.