If a blue-eyed man marries a brown-eyed woman whose mother was blue-eyed dominant what proportion of their children will have blue eyes?

Answer 1

• A male X-linked trait has only one allele. This is because they have one Y chromosome and one X chromosome. Females have two X chromosomes. Y chromosomes do not have alleles. Thus, the father must have had only one blue eye recessive allele. This means that 100% of the children will have brown eyes, unless there is, like above, something that goes awry from the typical biological rules. So this means that the original person was not correct. If you think I am wrong, just do a Mendel's Square.

• Genetic scientists are studying why some children have brown, green or blue eyes (some amber) when they have parents who have their own individual eye color. Genetic scientists highly consider the fact that millions of years ago all humans had brown eyes, but because of genetics this has changed. Since it is extremely complicated and involves DNA here is a link that can better describe the color of the human eye and how it is determined: http://www.thetech.org/genetics/ask.php?id=29

Answer 2

Brown eye gene = B

Blue eye gene = b

Each person has two copies of the eye color gene in their genome, one inherited from each parent. Now if both parents only carry the gene for brown eyes, BB and BB, then their child will receive one B from each parent, ending up as BB. The same works for blue eyes, if that's the only gene both parents carry, bb and bb. Each parents gives on b to the child, who ends up as bb.

If you have one parent who only has the gene for brown eyes, BB, and one parent who only has the gene for blue eyes, bb, then all the children will have brown eyes. Example: One parent gives a B, the other gives a b. Bb = brown eyes. Here's why: When you have two alleles (coding sequences) from genes that are at odds with each other, one version will override the the other. When dealing with eye color, B always dominates b. But these children now carry the b gene in them, and could pass it down to their own children. Some of them, depending on the other parent, could end up with blue eyes.

If one parent is Bb, and the other is bb, then each time they have a child, there is a 50% chance it will have blue eyes. Example: First parent is Bb, second parent is bb, then their children will end up as either Bb, bb, Bb, bb. If both parents carry the genes for brown eyes and blue eyes, then each time they have a child, there is a 25% chance it will have blue eyes. Example: First parent is Bb, second parent is Bb, then their children will end up as either BB, Bb, Bb, bb.

Answer 3

Assuming only one gene is responsible for eye colour:

Brown eye gene = B

Blue eye gene = b

Father - Bb (because the grandfather had blue eyes, he must have a b)

Mother - bb

Children - 50% Bb (brown eyes), 50% bb (blue eyes)

Answer 4

Can't tell unless you know whether the woman is carrying a recessive blue-eye gene. If she isn't, all the kids will be brown-eyed. If she is, some could be blue-eyed.

Answer 5

my dad had 7 siblings in all including him. his dad had blue eyes while his mom had brown. the first three had blue then the next two got green one got hazel and one got dark brown.

Answer 6

Answer

all blue