Does every ovul have the same genetic info?
963121
no each ovul has different combinations of genes.  When meiosis occurs each chromosome seperates independantly of the other chromosome so there can be a mix there, also there is occassional crossover where a chromosome will switch some of it's homologous (same) info with it's sister chromosome, since the genes on each sister chromosome may be different variations of each other, recombination can occur here as well
611701
A, they will have the same phenotype, but not necessarily the same phenotype.  If you are basing this question on simpler Mendelian genetics you could have both parents with trait A, resulting from Aa (parent 1) and Aa (parent 2), but the offspring genotype is AA.  They all appear the same, but they aren't on the genetic level.
431792
I just found out that Canadian scientists have found that a few women ovulate twice a month and others have the biological potential to do so. Hope this helps.
1052261
You are quite correct. This isn't a ground breaking observation or anything, although you did well to think of it on your own.\n\nThis is one of the major problems with hybrid animals and plants because the F1 generation is usually relatively uniform while the F2 generation can produce throwbacks to either or both grandparents. \n\nBecause the chromosomes are randomly assorted it is quite possible to produce an individual that contains little or even no genetic material from one or even two grandparents.
251199
Von Baer studied the development of embryos and found that all embryos follow a similar developmental pattern.  Darwin used this as evidence in his book (On the Origin of Species) suggesting that the reason for this similiarity was due to a common ancestor.
875716
probably none, but its depends on which parents genes are more dominant
245236
Horses have genes, and those genes determine what the horse will look like.  If there wasn't genetic variation, all the horses would look the same.
430415
To answer your question....yes.  The egg cells of the female all carry X chromosomes.  The sperm cells can carry either X or Y.  So basically, the sex of a mammal depends on the male, and which particular sperm fertilizes the egg (X).  If an X sperm fertilizes the egg, you have XX, which is a female, and if a Y sperm fertilizes it, you have XY, which is male.  This is why some sex-linked traits are more visible in males, such as color blindness, but that's a whole different post.
108053
Sure, \ntry www.genetic-programming.com It's Dr Koza's page.... you'll need some time to find the information.
430234
mostly determined by the genotype and mode of inheritance. Sometimes it can be epigenetic. some rules like mandelian inheritance, random seggregation, imcomplete penetrance, codomminance and give different phenotypes
635598
This is an example of a chimera. We all carry two copies for each gene, one from each parent. Rarely, one copy of one gene can get inactivated in a cell, or in a group of cells.\n\nPeople with two different coloured eyes carry two different eye colour genes, let's say brown and blue. Normally, the dominant gene would be the one you'd see, i.e. brown. If, however, during development the brown gene gets turned off or mutated in a cell that ends up giving rise to the area of the body that makes one eye, then that eye will be blue, and the other brown.\n\nNote that the same thing can happen within one eye - it means that the mutation happened later, so it was in a cell making only part of the iris, rather than the whole iris. There's a summary and theory discussion at the link below.
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.
1002322
No:\nThey too distantly related.\nAlso their chromosome number and chromosome and shapes and gene layout, and individual genes are vastly different, so they cannot pair up in the fusion that is part of of the fertilisation reaction.
786358
When Mendal observed that his 7 traits assorted independantly of each other in peas, he assumed that all traits assorted independantly of all other traits, and made that a law of inheritance.\n\nWell, we know know that's wrong.  We observe that while many pairs of traits assort independantly, many other pairs do not.  Thomas Hunt Morgan's lab first observed that fuit fly eye color was linked to fly sex.  Other people observed that other pairs of traits were not totally completely linked, but that they were not totally independant either.  When two traits were found to not assort completely independantly, the term used to describe that situation was "linkage".\n\nWe now know that linkage happens because genes aren't floating around as perfect little gene spheres, bobbing around the nucleus.  They are arranged "like pearls on a string" on chromosomes.  So genes that are on the same string will not assort independently.  Meiosis will sometimes split them, sometimes not, depending on how close the genes are to each other.  They are physically linked, and we call the dependant assortment linkage too.
190009
yeah like the first person says. it all depends because there are dominant and recesive genes or chromosomes or whatever, and i think green is dominant, but if you get get 2 blues they dominate over 1 green, i think that is how it works.
956460
To start with, You need more information as to the Parental genotype for each question, \nFor example in question (a) since you have only mentioned full dominance, we can either assume both parents will be A/A x A/A. However this cross is useless because you know there will not be variation in the F1 progeny because both are dominant. thus the ratio is 100% all dominant A/A.\nThe second assumption is to cross a dominant parent A/A with a recessive parent a/a. If that's the case then you choose one gamete from each parent to form the F1 as follow\n\nParental Genotype        A/A    x    a/a\nGametes                          A     x    a\n\nF1                                         A/a\n\nfrom here, if you need to get genotype and phenotype ratio for your F2, you need information as to what kind of cross you want do. You can self the F1 or you can testcross with a recessive parent. In either case the ratio is different\n\nSelf-cross                  A/a    x      A/a\nGametes              1/2 A , 1/2 a    x   1/2 A , 1/2 a\n\nF2  punnet square\n..............1/2  A..........1/2 a\n\n1/2 A......1/4 A/A........1/4 A/a\n\n1/2 a.......1/4 A/a........1/4 a/a\n\nPhenotypic ratio of F2:  1/4 A/A; 2/4 A/a; 1/4 a/a = 1:2:1\nGenotypic ratio of F2:  (1/4 A/A + 2/4 A/a); 1/4 a/a = 3:1\n\n\n\nTest-cross                  A/a    x      a/a\nGametes              1/2 A , 1/2 a    x   1/2 a , 1/2 a\n\nF2  punnet square\n..............1/2  A..........1/2 a\n\n1/2 a......1/4 A/a........1/4 a/a\n\n1/2 a.......1/4 A/a.......1/4 a/a\n\nPhenotypic ratio of F2:  1/2 A/a; 1/2 a/a = 1:1\nGenotypic ratio of F2: same as genotypic ratio\n\nquestion (a) is not formulated in a clear way. for example. question (a) should have mentioned something like this:\n\na) The F2 of monohybrid cross with both parents full dominance, or 1 parent full dominance, 1 parent recessive.\n\nIs hard to work in genetics problems when the problem lacks crucial information. let me know if there is more information that you did not write down on your question.
769528
As the mother of identical twins I hear these types of questions alot:\n\n1. Identical twins are from the same fertilized egg which splits.  They have the exact same DNA which means their blood type is also the same.\n\n2. Fraternal twins are from two different fertilized eggs.  They are brothers/sisters who happen to be born at the same time.  Biologically, they are as similiar as any other brothers/sisters.  They could have the same blood type but they may not.  They will not have the same DNA.\n\nHope this helps!