Me and my friend are doing a project in Science and I was wondering\nif there are any good websites on dominant and recessive gene traits that we could get a look at.
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In genetics, the term "recessive gene" refers to an allele that causes a phenotype (visible or detectable characteristic) that is only seen in a homozygous genotype (an organism that has two copies of the same allele). Every person has two copies of every gene, one from mother and one from father. If a genetic trait is recessive, a person needs to inherit two copies of the gene for the trait to be expressed. Thus, both parents have to be carriers of a recessive trait in order for a child to express that trait. If both parents are carriers, there is a 25% chance with each child to show the recessive trait.\n\nThe term "recessive gene" is part of the laws of Mendelian inheritance created by Gregor Mendel. Examples of recessive genes in Mendel's famous pea plant experiments include those that determine the color and shape of seed pods, and plant height.
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http://biology.about.com/\nI don't know what your scope is. \nThat site is a very great and big source of biological knowledge. There are so many topics and I hope you will find it useful.\nGood luck!
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Genetics and evolution.
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Well if they ensure that the mate a homozygous dominant with a homozygous recessive (eg B/B x b/b, as is the case in monohybrid crosses, you can make sure the parents have this genetics by watching them over generations, mating only dominant with dominant and recessive with recessive) then you'd know that for a diploid plant/animal, as all offspring get one gene from one parent and one from the other, all of the F1 would have to be B/b - so heterozygous for that trait. So they'd all be the same genetically for that particular trait! But then if you crossed the F1 with one-another they wouldn't all be the same... crossing heterozygotes youd get some B/B, some B/b and some b/b...
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Ok, here's how it works. It seems that you need genotypes. A homozygous trait is a trait that is both dominant and recessive. Therefore, the organism possesses the dominant trait. A heterozygous genotype is always dominant (dominant is dominant over recessive). For example, brown hair (B) is dominant over blond hair (b). a heterozygous person will be Hh, and will have brown hair even though both alleles are present.
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Your friend is correct. I just studied this in school. Dark hair always dominates light hair. And the allele for green eyes overpowers the allele for blue eyes.
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this might help\nhttp://www.sciencebuddies.org/index.htm?gclid=CNKB5o6Y4ogCFRZQTAodPm_rjw
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http://www.ncbi.nlm.nih.gov\n\nThis is the government website for DNA. Has a lot!! This is what research scientists use.\nJust type in a gene or keyword in the box and click go.\nPubMed in the drop down box has a lot of articles on genes.\n\nalso try:\nhttp://www.ncbi.nlm.nih.gov/Genomes/\n\n Lots of animals to pick. Choose a chromosome. Choose a region.\n\nYou can find out tons using NCBI (National Center for Biological Information). Have fun
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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.
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I'd say no. Location has nothing to do w/ genes UNLESS you isolate the people in each city so the people inside them cannot reproduce with other people from different cities. Over time you MIGHT be able to see little distinctions because the dominant traits will have been passed around to everyone and then they will express it.
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Ok, this sounds like a homework question so I'll give you some pointers.\n\n1) Color blindness (being a sex-linked trait) is recessive.\n2) So, the fact that they have a color blind kid means that the child is pure recessive so the mother must be a carrier.\nBased on this, a recessive father (cc) and a carrier mother (Cc) = work your Punnett square.
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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.
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well, hope these help:\n\nhttp://www.bbc.co.uk/dna/h2g2/A388217\n\nhttp://www.chemistrysurvival.com/
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ABLE-Hot Biology Websites. I love biology, especially microbiology and am always looking for good, interactive websites like this one. It has animations and images. I have saved it to my favourites to explore it further myself. Good Luck.
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Genes are not really dominant or recessive, alleles of genes are dominant or recessive.  Alleles are the different forms a gene can take - ie, different alleles have slightly different sequences.  Dominant or recessive just refers to which allele codes for the protein that is actually going to have an impact on the phenotype (how an organism looks).
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It's very possible. My best friend is Native American, and she is as blue eyed/blonde as them come. Recessive genes can toss you through a loop. Give him the benefit.
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look here:\n\nhttp://www.biologie.uni-hamburg.de/b-online/e18/18c.htm