Can genetics of mother and child with 100% match be a result of incest?
362355
100% match is impossible, unless the mom is impregnated with her own frozen twin's embryo.
54152
Biostat girl is correct.  In the formation of gametes, the chromosomes are independently assorted, and that's after homologous recobination, where maternal genes and paternal genes aon homologous chromosomes get shifted back and forth to make completely random new chromosomes that have genes from either parent.  So the probability of complete similarity in that situation is the same as that for siblings: theoretically possible but with a statistical probability of essentially zero.
313763
To put a check on population levels.  Seriously.\n\nA link between a mother having high fertility and  her chances of having a gay child has recently been discovered.  This connection resolves the objection that homosexuality should have been bred out of existence if it were hereditary.  The increased fertility of the mother cancels out the lack of offspring of the homosexual child.
692190
Only if a genetically recessive trait runs in the family and both the guy and his sister have the defective chromosome, only then does the baby risk having a birth defect or mental retardation - even then(ie, with the defective recessive chromosome in both), the chance would be 1 abnormal child out of 4. If the guy and the sister have no such defective chromosomes, then the question of an abnormal/retarded child does not arise.\n\nIf, however, a genetically dominant trait runs in the family and either the guy or his sister have the defective chromosome, then the risk increases to 1 in 2  and if both have it, then the risk is 3 out of 4.\n\nIn any case, whether the baby will be normal or abnormal cannot be determined until a karyotyping of both the guy and his sis is done. Having said that, the rate of such disorders is quite low and in all probability, the child will be normal.
73114
There is about a 1 in 10 billion chance that someone would have the same dna as you, unless you have an identical twin.  Scienctists don't like to say "never", but that's really close.
524113
everyone has the same amount of genetic information.  a child's dna is a combination of both parents. a mother's dna is irrelevant in a paternity test because the test's goal is to see whether the child has any genetic information from the father.\n\ncrudely put, it works something like this. imagine chromosomes are marbles. the mother has 46 red marbles and the father has 46 blue marbles. each parent will donate 23 marbles to the child so the child will have 46 as well. a paternity test compares the blue marbles of the child against the proposed father. if they match, then the father has been determined. but there's no need to examine the child's red marbles because the mother donated those.\n\nthe analogy can be drawn out to include various genetic issues that arise in gametogenesis (the process of making sperm and egg cells). but hopefully this answered your question.
848996
No. A baby gets his DNA from mom and dad. Dad contributes 1/2 mom contributes 1/2. (Yes, this a simplified answer.)\n\nDNA testing can prove paternity because it looks for genetic markers that come from the dad.
1115203
Can a man have, let's say, B+? Yes.\nCan a woman have, let's say, B+? Yes.\nCan they get married? Yes.\n\nExact same blood type will not be a problem. Only way for problem is if baby is + and mom is -. Only way for that to happen is if Dad is + and mom is -.
844824
Chimerism is an extremly rare condition, a person is born with the dna of two people, twins only one never made it out and was basically absorbed by the other. A mother may have a child but the chields Dna will match a sister that never existed. Very strange disorder that was reported on by 60 minutes i Believe a few months ago. you should look into it more
124648
100% of sons will be colorblind\n100% of daughters will be carriers\n\nYes this could stand up in court because there is no chance that the daughter recieved one of the recessive alleles from her father (because he would have to express the trait if he did).\n\nHowever, the man can still be her father, if a random mutation occured, x inactivation occured on the chromosome containing the dominant allele, chimerism, or perhaps an error in another gene caused the color-blindness...\n\nMost likely though, the man would not be her father. A deduction would not be made only on the fact that the daughter is color blind and the father isn't. A paternity test would need to be done.\n\nAnd I don't know what the hell kittybriton is talking about. People shouldn't attempt questions they don't know the answer to.
29268
Yes.  I have heard that there is a `gay` gene that determines a persons sexuality.  This is hereditary from ones mothers side.  \n\nThere has been a lot of scientific research into these genes and conclusive proof that it is hereditary.\n\nHowever, I accept that some people choose a gay lifestyle themselves even if they are `born` straight.
675496
I don't see how it is false either. I mapped it out, and here's what I got. The eldest lady (grandma) could be XcXc (homozygous for colorblind). Grandpa must be XhY (hemizygous for hemophilia). This makes normal woman XcXh (the Xc would be normal for hemophilia and the Xh normal for color, masking the expression, resulting in normal). Husband must be XcY(hemizygous for colorblind). Son could inherit Xc from mom, thus being Xc (colorblind). Daughter could inherit Xh from mom and must inherit Xc from dad, thus being XcXh (the Xc would be normal for hemophilia and the Xh normal for color, masking the expression, resulting in normal). Please let me know if there is an error.\n\nSon cannot be normal; he'd be either Xc or Xh which is either colorblind or hemophilia.
933813
I have no hard facts, but i seem to think the chance is about 50/50. I know of more then one family with more then one gay child.\n\nI also know of boy/girl twins, one is a lesbian and the other is gay.
875716
probably none, but its depends on which parents genes are more dominant
270763
no if they do it will be very rare.They have the same family outlines like 1 sister 1 brother a wife/husband or the same # of children.
1061755
yes its def possible. you dont have to share the same blood to love each other unconditionally. people who can accept other's children and love and care for them like their very own are few in this world! good for you!
50708
This is really all about genetics. Each person has differing genes and inherit family traits!