why,in some cases,father does not inherit the character to his sons?(genetics)?
352274
it depends if youre asking about a sex-linked trait or not.  if a sex-linked trait is in question, then the mother gives the son her x chromosome that has one copy of all the genes on her x chromosomes, the father will contribute the y chromosome.  however, if the trait is x-linked and the father expresses it then there's no way to pass it on to his son as he is only passing on his y chromosome.  if it't not sex linked then it's just a random luck of the draw on which genes that kid will get.
390146
No, because such an instinct would probably be genetic. If there was such an error, then those people would not reproduce and therefore would not pass on that gene! The gay "error" you're talking about is not the same because it is not actually genetic in the hereditary sense.
492162
its true that no two person can have the same DNA...\n\nbut the determination of parental disputes is not done by matching the DNA but by matching the small sequences present on the DNA known as Genes...\n\na collection of a set of genes on DNA is called chromosome..\n\nsince a child has 50% characteristics of both the father and the mother, he has the same set up of genes in his/her chromosomes.. on the chromosomes, there are many sites which are exclusive to that set of gene and chromosome and are known as VNTR's VARIABLE NUMBER TANDEM REPEATS...\n\nthese sites are very unique, they differ from person to person but remain in the same place in a lineage.... this very property of the genes on the chromosome containing DNA accounts for the determination of parental disputes..\n\n\nfor eg:   suppose in gene A, of Chromosome 1 ur mom has 5 VNTR alternatively and ur dad had 3...\n\nso if u a guy then u'll have the same 3 VNTR's on the gene containing chromosome..\n\nas simple as that..\n\nhope u got the point...
591863
The answer is "b"\n\nAssuming the dwarf characteristic is recessive, since about half of the offspring were dwarf, that means that half the offspring have to by homozygous for the dwarf genotype (tt).  The only way to get that is to cross the Tt and tt.  Thus you get half the offspring being Tt (tall) and half being tt (dwarf).  If you cross a homozygous dominant (TT) with anything else, all the offspring will be tall, because all will carry at least 1 "T" gene.  If you cross "Tt" and Tt" then you get 1/4 TT (tall), 1/2 Tt (tall), and 1/4 tt (dwarf).
444742
Not if the son was from a previous marriage, then the son would not be a blood relative!
389803
no specific answer, but the previous one cannot be true, as if this were the case, over time men and women would be of the same height... traits have binary states, they either exist or they don't, so you could get either the height of your father or mother or someone else in your ancestory, no averaging.
974731
For each trait (or each contributor to a trait, but I'll keep it simple here), each person has two genes.  Also, for each trait, there is a dominant and recessive allele.  In order to have the dominant version of the trait, one only need have one of the dominant alleles.  In order to have the recessive trait, you have to have received the recessive gene from both of your parents.\n\nFor example, let's say that both of your parents have a dominant trait (say, having five fingers), but both are carriers of the recessive gene (six fingers).  I'll use F to denote the five-finger gene and s to denote the six-.  Here are the possibilities for their children:\n\nDad:  Fs\nMom:  Fs\n\nThere are four possibilities:  FF (five), Fs (five), sF (five), and ss (six).  So, on average, 25% of this couple's children would have five fingers and no chance of passing hyperdigitosis to their children; 50% would have five fingers but carry the gene for having six; and 25% of their kids would be able to give their friends "high-sixes."  The kids with six fingers would be guaranteed to pass that gene on to their children, but their children would only end up with the extra digit if their mother also passed that gene to them.
216288
When you were born does not determine your traits.  Heredity and environment determine your traits.  Astrology is mythology, and is useless in determine how a person will be, what will happen to them, or who they are compatable with.
268676
There are actually duplicate genes for every function. You received one from your mother and one from your father. If one is missing or defective, the other takes over. Sometimes both are required and you would express a recessive trait. If the gene is crucial, your life is shortened or aborted.  Some conditions have an entire chromosome missing (Turners syndrome) without catestrophic effects.
110987
I believe that I was taught it is genetic... your mother or your father have the gene and pass it to you... they don't have to be a lefty... only have the gene
1061261
4 out my 5 sons have their dad's blood type while only one has mine. It really doezsn't matter though......\nWiserangel is nuts. A child HAS to have the blood type of one or the other parent. Can't just have one made up..........
13346
Such characteristics are shaped by the chromosomes you receive from your parents. There's a gene for every color of eye, color of hair, thickness of hair, color of skin, thickness of skin, shape of eyes, weight, height, life span, character, etc.\n\nEvery person receives information for every part from 2 people, so it will have 2 probably eye color, hair color, etc. Even when only one will appear, that person still can give the other gene to a child.
251848
Well there are so many technicalities revolving around this question. While biologically speaking you could call the children sibblings is erelevant to the question. Manly because they will have there own genetic codes.  That is where this becomes quite complicated because genetics deals with more than just genes it deals with traits, DNA, Chromosomes, Blood Types, etc...  As far as them being related, coming from not only the same father, but an identical twin they are going to have very similar genes.  In fact when it comes to there family traits it will be identical.  However no individual, no matter if they are identical will ever have the exact same genetics (in the broad since) as another because that would go against the natural law of diversity.  So sumary exact same family traits, but overall two different people (genetics).
967402
Because when you keep breeding close relatives you not only get the "good" traits but you get the "bad" traits in the next generation as well.  When you mix the genetic pool you cut the odds of the bad traits being carried to the next generation.\n\nAn example of this would be purebred dogs.  Many purebred dogs have specific defects in each breed because that gene was carried forward into the next generation as well as the good or desirable genes.\n\nMutts rarely have those types of problems.
721123
Marfan's is a genetic disorder.  It's dominant, so the gene can be received from either parent, but it doesn't have a high penetrance, so just carrying the gene doesn't mean you will develop Marfan's.  The mutation also seems to arise spontaneously, so that about 30% of those with Marfan's did not receive a damaged gene from either parent.
733154
This is because Barth Syndrome is an x-linked recessive trait.  Girls are primarily only carriers of the syndrome and are Xx.  Thus the son has a 50/50 chance of getting the syndrome and being either xy (affected) or Xy (not affected) due to males only having one X chromosome
1092070
The problem with this theory is that the "gay gene" is not being passed on to the next generation, because reproduction does not transpire.  All evolutionary traits depend upon the trait being passed on to the successive generation.