if two heterozygous persons have children, what is the probaility that a child will be an albino?
921869
25%.  For the Same Gene Defect.
725772
A homozygote's cells are diploid or polyploid and have the same alleles at a locus (position) on homologous chromosomes. When an organism is referred to as being homozygous for a specific gene, it means that it carries two identical copies of that gene for a given trait on the two corresponding chromosomes (e.g., the genotype is AA or aa). Such a cell or such an organism is called a homozygote.\n\nA homozygous dominant genotype occurs when a particular locus has two copies of the dominant allele (e.g., AA). A homozygous recessive genotype occurs when a particular locus has two copies of the recessive allele (e.g., aa). This can occur when both parents carry at least one copy of the allele.\n\nPut simply: Homozygous is just having two of the same alleles.
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).
118944
depends whats the orgin of the genes they'll either homozygious or hetrozygious.. not only in hair genes, in any gene
983707
you have 2 chromosomes. imagine that half of one goes to the other, and the other's half goes to the first one. that makes a 2 new chromosomes with different genetic material. That makes the progeny different from the parents. example. chromosome one (blonde air + green eyes) makes crossover with cromosome 2 (black air + brown eyes), will make chromosome 1 (blonde air + brown eyes ) and chromosome 2 (black air + green eyes)
548899
It could be any colour from ebony black to snow white.See the link below for an extreme example.\n\nSkin colour genetics is not simple recessive/dominant. It is a very complex trait based on at least 8 genes on 5 different chromosomes. As a result it is perfectly possible for children to be considerably darker or lighter than either parent. \n\n\nBeing "mixed heritage" makes no difference whatsoever. All humans are of mixed heritage and always have been. There isn't some hypothetical pure human heritage that has only one skin colour present.
324822
Segregation in cell division, when it goes correctly, results in each meiotic daughter cell having half of the genetic material of the parent.  The catch is, however, that there is no rhyme or reason a certain chromosome will go one way or the other.  So a child will share on average 50% of their geenetic material with each parent.\n\nIn terms of probability, I'm not certain what you mean, so I'll try to just give you my take on it.  If you're talking about the probability of the offspring having a certain allele when the parent is heterozygous, the probability is 50%.  There's a 50/50 chance that when the chromosomes segregate, the one with the allele in question will go to the offspring.  If you've ever done a Punnett square, you can see this: the allele in question will be present in 2 of the 4 boxes, or half of the total.\n\nDoes that help?
826482
As I recall, the map unit is a 1% chance that two genes will sort independently. So, 13% will be al/+ phenotype, 13% dp/+, 37% are al/dp, and the other 37% are wildtype. I think... definitely check this before you accept it as true.
341693
The mother and child will have *nearly* identical DNA.  There will be a few mutations because mutations are ubiquitous, but 99.99+% of their DNA will be the same.
755896
The Blood types would have to be 50% chance of Oo and 50% chance of Ao. Remember the three possible alleles in blood are A, B and O, out of the three only O is recessive. So in order to be heterozygous A you have to actually be Ao, If the other allele was a B, it would be AB. Because O is recessive, any individual with O blood type is automatically Oo. The punet squar then looks something like the following\n\n______ Oo\nAo___Ao Ao\n_____Oo Oo, \n\nHope that helps
848151
Its actually more complex than a typical simple black and white mix (referring to color)\n\nAlbinism is a genetic disorder that is quite recessive.  The possibility of the resulting child having the color of black, white or "blended" would depend if the child inherits the albinism. \n\nInheriting the afican parent's albinism depends on the caucasion's popsibilty of passing along albanism as well. \n\nTaking the albinism factor out of the equation and it is safe to say that the offspring of a person with black skin and a person with white skin will result in a blending of the skin colors. \n\nIt is also safe to assume that the offspring will appear to have more of an african-american (black) look as opposed to a caucasion (white) look and would appear to be a child of mixed heritage.
953556
Yes. \n\nBlonde hair is a recessive gene, linked to a number of chromosomes. For simplicity's sake, assume it's just linked to one pair. The fact that it's recessive means that if only one chromosome out of the pair is blonde (and the other is brown), the person will have brown hair. Each person then contributes one chromosome out of that pair to their children. So two people with brown hair whose chromosomes are Blonde-Brown could have a child with blonde hair (if they both give the Blonde gene).\n\nSince you have naturally blonde hair, your chromosomes are Blonde-Blonde, so the child's hair color will depend entirely on your husband - that's why someone said the odds are 50%. In fact, multiple genes determine hair color, so that isn't quite correct, but you get the idea.
782521
Blue eyes are recessive qualities.  Both parents must have the trait for the children to have a greater chance of getting it. And unless they get it from both they will still not have blue eyes.
119148
A recessive trait can be passed on in a family lineage infinitely and not present itself until two people who have that recessive gene mate and produce a child who gets both the recessive gene from both parents.
695108
First you have to make out your alleles.  Your first parent PpLl will produce spermatozoids that can be either PL Pl pL pl.  As for the mother, she is also heterozygotous for both traits, so she is also PpLl and will produce eggs that are either PL Pl pL or pl.  The you make the Punnett square with all those four colomns and four rows.  You should get something like\n___|_PL__|_Pl_|_pL_|_pl__\nPL_|_PPLL|_PPLl_|_PpLL_|_PpLl_\nPl_|PPLl|_PPll_|_PpLl_|_Ppll_\npL_|PpLL_|_PpLl_|_ppLL_|_ppLl_\npl_|PpLl_|_Ppll_|_ppLl_|_ppll_\n\nOKAY NOW...\nPPLL means healthy all the way\nppll means has all the diseases\nIn between they are heterozygotous for one or both disease.\n\nSince you have 16 possibilities, then yes your 1/16 answer is correct for the probabilities of having both diseases\n\ncan you do the square for your second problem :-)
761641
Ss and Ss\n\nGenotype of both parents are heterozygous. If you draw out the Punnet square, you see 1/4 of the offspring will have long hair while 3/4 will have short hair. The phenotypic ratio of long hair to short hair ends up being 1:3, just like the puppies are 2:6.\n\nGenotype ratio ends up being:\n1/2 heterozygous Ss\n1/4 homozygous dominant SS\n1/4 homozygous recessive ss\n\nHope this helps.
710676
What causes albinism?\nThe main problems of albinism are caused by the inability of the body to produce melanin pigment (whose major role in the skin is to absorb UV light from the sun so skin is not sun-damaged). It also has a role in the development of normal vision of the eye. Albinism is mostly a recessively inherited disease, which means that you have inherited two albinism genes (one  \nfrom each parent). If your parents are only carriers of albinism (each having one albinism gene and one normal gene) they will have enough genetic information to make normal pigment and will not show any signs of albinism. \nThere are many genes which are now scientifically proven to be associated with albinism (or better: alterations of the genes). All alterations, however, lead to an alteration of the melanin (pigment / colouring) production in the body and the eyes. Melanin helps protect the skin from ultraviolet light coming from the Sun (see human skin color for more information). People with albinism lack this protective pigment in their skin, and can burn easily from exposure to the sun as a result. Lack of melanin in the eye often results in problems with vision, as the eye will not develop properly without the pigment.\n\nIndividuals with albinism (called albinos) generally have white hair and pale skin which makes them stand out. Often hair pigmentation is not completely absent (white) but shows a pale or medium blonde. Often the affected persons are paler in complexion as the rest of the family. The myth that all persons with albinism have "white hair and red eyes" is not true. Growth and development of children with albinism should be (and is) normal however, as should their general health, life span, intelligence, and ability to have children. The chance of albino children resulting from the marriage of an albino with a non-albino is very low.