What are the kinds of gametes that can be produced by an aabb individual?
139440
An aabb individual can only produce one type of gamete, ab.
764087
So that two haploid gametes (1 egg and 1 sperm) make a diploid embryo, with two sets of chromosomes (a maternal and paternal set).  When this happens, you get a genetically unique offspring with a full set of chromosomes.
904389
First, note the word "true-breeding".  That indicates each plant is homozygous for all those traits, which means that you don't have to worry about that plant being het for any of those genes.  And it means that they only make a single kind of gamete with regard to thsoe 4 genes.\n\nTechnically, these loci might all be linked to each other, you would need F2 data to know for sure.  But you are supposed to assume that four traits are controlled by 4 genes.\n\nNow, since the parents were homozygous for all their genotypes, the offspring will all be identical, they will all be het for those genotypes.  And which ever phenotype they are, that's the dominant one for that trait.  So purple, green, terminal, and yellow are the dominant phenotypes.\n\nAnd there are 16 different gametes to be made, because there are 4 genes (presumably) and each is het in the F1.\n\nThe only way for an F2 to show all 4 recessive phenotypes would be for it to get a gamete from each parent taht also had all four recessive alleles.  So 1 in16 gametes will fit the bill, so the odds of getting that gamete from on parent is 1 in 16, the odds of getting it from the other parent is 1/16, so the odds of getting it from both is 1/256.
860073
D is the answer.  One cell differentiates and the other cell remains pleuripotent (has the ability to differentiate into many other types of cells).\nHere is why the other choices are incorrect.  Sometimes the other cell will die.  This happens in certain types of ground tissue, but only after the cell has differentiated into a specialized type of cell, which is why A is not the answer.  B is not the answer because gamete in plants is only formed by mitosis.  Only the gametophyte produces gametes and gametophytes are haploid so they only need to undergo mitosis to produce a gamete.  C is not the answer becuase the formation of a zygote requires the fusion of two cells, which does not happen under hte conditions of this question.
579289
FALSE -there is no single gene for each antibody- not at least in the traditional/classical sense (those intact in the zygote, the first cell of an individual).\n\nThere are much more varieties of antibodies than the number of inherited, intact genes. But every variety of antibody can be traced back to one 'constituted gene' (developed in the adult stage, not inherited as a piece). There are fragments of genes that are present in the zygote but randomly mixed later during development. This mixing happens in various combinations to form different types of genes in different antibody-producing cells (lymphocytes). There is also further variety introduced after the RNA is formed. Hence, each cell (lymphocyte) or its clone produces different antibody in our body.
574297
no, he can't be the father of both children... the man (or male/m) with a blood type AB  has a genotype of AB while the woman with blood type B can either have a genotype of BB or BO...\n\nif a man with genotype AB is crossed with a woman (or female/f) with a genotype of BB then...\nm&#92;f B B\nA AB AB\nB BB BB\n-----------\n2 AB : 2 BB\nor 50% type AB and 50% type BB\n\nbut if a man with genotype AB is crossed with a woman (or female/f) with a genotype of BO then...\nm&#92;f B O\nA AB AO\nB BB BO\n-----------\n1 AB : 1 AO : 1 BB : 1 BO\nor 1 AB : 1 AO : 2 B_\nor 25% type AB, 25% type A and 50% type BB\n\nthus, he can be the father of the child with type A blood but he cannot be the father of the chid with type O blood.
2224
Gametogenesis is the process by which gametes (spermatocytes and ova) are produced in our body
155054
Phenotypes: AB+ or AB-\n\nAntigens: A and B\n\nGenotypes: AB (+ or -)\n\nThanks micro_girl.  I should have made that more clear.  A and B are separate proteins, and when they are both present the resulting phenotype is AB.  Sorry if my original answer was misleading.  I fixed it.
839480
Hi Erica, \n\nI'd waste both your and my time if I try to answer this question with lots of detail. I'd suggest you go to your textbook, flip a few pages here and there, get a broad idea and then, come back and read this answer. \n\nPlease notice that I'll have to make this answer less complex by generalizing concepts and avoiding some fine details which you can easily read in your textbook.\n\nNow, without wasting much time, here is my answer-\n\n===================\n\nCharacteristics of animal sexual life cycles-\n\n1- Usually, there are two parents- male and female. Both form special haploid cells called gametes by meiosis.\n\n2- Gametes fuse in pairs to form diploid cells called zygotes (fertilization).\n\n3- Repeated mitotic divisions of the zygote forms embryos.\n\n4- And the embryo develops into a new individual.\n\nSooo simple!\n\n====================\n\nCharacteristics of plant sexual life cycles-\n\nIt is same as animal sexual reproduction. Just that the technical terms and the methods of reproduction are a little different in flowering and non-flowering plants. I suggest you to read your textbook for the detailed terminology.\n\nIn plants-\n\n1- Diploid sporophytic cells divide by meiosis to give haploid gametophytic cells.\n\n2- Haploid gametophytic cells from male and female fuse to form the diploid zygote.\n\n3- The zygote then develops into an embryo and then to a full diploid plant body.\n\n* There are lots of finer details like the flowering system in flowering plants: pollens, ovules etc. and sporangia in non-flowering plants. I suggest you to study the life cycles of different bryophytes, gymnospermae and angiospermae to get the idea.\n\n================\n\nCharacteristics of fungal sexual life cycles-\n\n1- It involves fusion of two compatible sex cells/ gametes. The sex organs that produce gametes are called gametangia.\n\n2- The gametangia of fungi are unicellular and are surrounded by a sterile jacket. In fungi, there is a gradual reduction in sexuality from lower to the higher fungi.\n\n3- In the first stage, the cytoplasms of two sex cells fuse with each other but the nuclei do not fuse. The cell is thus called a dikaryon. (Plasmogamy).\n\n4- The nuclei then fuse to form the synkaryon. (Karyogamy).\n\n5- The diploid cell after that, produces haploid nuclei by meiosis.\n\nThere are broadly five types of sexual fusion in fungi.\n\nHere they are-\n1- Planogametic copulation. \nOne or both of the gametes are motile.\n\n2- Gametangial contact. \nThe two gametangia come together and the male gametangia forms a tube through which the male non-motile gamete is sent to the female gametangia.\n\n3- Gametangial copulation. \nThe gametangia themselves fuse together and lose their sexual identities to form zygospore.\n\n4- Spermatization. \nNumerous spore-like minute bodies (spermatia) are sent through various agencies to the receptive hyphae or trychogyne of female gametangium.\n\n5- Somatogamy.\nIn this mode, sex organs are not formed and the fusion occurs two vegetative cells resulting in the formation of dikaryon.\n\n=================\nI hope the above info helps.
321706
female sex cell-gamete-egg cell
135811
gene I think is what you are looking for. Not sure the question makes sence.
1003518
First question. If you mean sexual interciurse then of course, IVF (AI) etc\nBut as this is biology then ill assume you mean syngamy between gamets. \nIn which case the option is cloning which is not established as viable in humans yet (Korean research is under fraud investigation so its validity unclear at present) but is not permitted in most countries anyway.\n\nAs to the second question:- NO\nAsides one alleged and unlikely case (the virgin birth of mary yielding jesus christ which if it was true (unlikely) was a dead end as it was a male), parthenogensis (asexual reproduction) has never been reported in humans. Morever it is very unlikely to be viable or to occur due to imprinting etc.
696673
well certain genes on the chromosomes will be transfered to different ones which means the gamits produced in meiosis will have different genes than the parent and it will be a mixed half not a normal half
384546
If the haploid cell is involved in fertilization, the condition is called trisomy. For example, if an egg cell with two chromosome 21s fertilizes with a sperm cell with one chromosome 21, the offspring will have trisomy 21, more commonly known as Autism.
828620
Male sperm and Female ovum in suitable conditions!!!
515090
dominant e.g. Aa, AA - Recessive -aa
219241
Scientists have reported that they've found an "extremely unusual" trait in the cells of some mothers with two or more gay sons, providing more evidence to suggest that homosexuality might be inherited.\n\n\nMothers of multiple gay sons were about six times more likely than other women to process their X chromosomes in a certain way, researchers discovered.\n\n\nResearchers aren't entirely sure what the findings mean, said study co-author Sven Bocklandt, a postdoctoral researcher at UCLA. Making things more complicated, about 75 percent of mothers of multiple gay sons don't have the trait.\n\n\nStill, the study, released Tuesday in the journal Human Genetics, raises plenty of questions, Bocklandt said, especially as researchers try to figure out whether homosexuality has genetic roots and if there truly is a "gay gene" -- or genes.\n\n\n"What everybody wants is the gene, and we don’t have it yet," Bocklandt said. "But this is an independent confirmation that the X chromosome is involved."\n\n\nBocklandt and colleagues looked at a phenomenon known as X-chromosome inactivation, in which cells inside the bodies of females automatically turn off -- or inactivate -- one of their two X chromosomes. That leaves them with one working X chromosome -- just like males, who have a single X and a single Y chromosome.\n\n\nNormally, each cell in a female's body randomly turns off one or the other X chromosome. In some cases, such as when families share a genetic disease, there is "extreme skewing" -- one X chromosome is more likely to be turned off than the other, Bocklandt said.\n\n\nIn the new study, the researchers looked at 97 mothers of one or more gay sons and 103 women with no gay sons to see what their blood cells did with their X chromosomes. The researchers recruited many of the women with the help of PFLAG.\n\n\nThey found that nearly a quarter of the mothers of multiple gay sons inactivated the same X chromosome -- in other words, nonrandomly -- compared to just 4 percent of the women without gay sons. Of those with one gay son, 13 percent inactivated the same X chromosome.\n\n\nDr. Ionel Sandovici, a genetics researcher at the Babraham Institute in Cambridge, England, who is familiar with the research findings, cautioned that the study is small, with just 44 mothers of multiple gay sons being examined. More research in larger groups must be done to confirm the results, Sandovici said.\n\n\nThe research does provide "circumstantial evidence" that the X chromosome contributes to the development of male sexuality, Sandovici said. But "we still understand very little about molecular mechanisms of sexual orientation, and this seems to be rather a complicated biological puzzle."\n\nBut of course its Nature vs. Nurture and its possible that the person could just become gay because of his environment/experiences or just be born that way.