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7/18/2013 7:24:00 AM
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Biology gene question
I'm a bit confused here, Flood.
Okay, so I was studying Biology by doing a practice multiple choice test. I came up to a question which goes like this:
[u]If short hair in dogs is dominant, then[/u]:
A. Mating of Short haired dogs would produce only short haired offspring.
B. Mating of Long haired dogs would produce only Long haired offspring.
There were two other options, but forget those.
I picked A, but B was the correct answer. I don't get it, shouldn't the mating of two animals with a dominant gene always produce offspring with that gene?
Or am I just really derpy?
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1 ReplyEdited by SLAMt4stic: 7/18/2013 7:44:38 AMSince (Option A) Short hair is dominant that means a dog could potentially be carrying both the recessive gene (long hair: a) and the dominant gene (short hair: A). This means that the dog has the potential to have a long haired puppy if the short haired dog it mates with also has this recessive gene (remember the punnet square, pictured above). The long haired dogs (option B) would need to have two recessive genes in order to have long hair, so they only have the ability to pass on that recessive gene.
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Donkeys have a long schlong.
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Punnetts square, learn it
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Recessive gene trait is my guess. I'm realizing now I need to study more biology.
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Edited by Fruit: 7/18/2013 7:36:46 AMIt's not A because they could both have a dominant and recessive gene (Which still gives them short hair because well, it's a dominant trait), which means they have a chance of producing offspring with long hair :P But B makes sense because for them to both have long hair, then they must have only recessive genes :P So because they've only got recessive genes, they can only have offspring with long hair!
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Edited by LolWutBBQ: 7/18/2013 7:35:31 AMB makes sense, for long hair to be present there can't be any genes for short hair (because those genes are dominant and then the dog would have short hair) which means if you only have long hair genes then the offspring can only have long hair. Source: Took AP Bio last year
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7 RepliesEdited by Charlemagne: 7/18/2013 7:29:43 AMI'll take a stab at this. While option A has the dogs shorthaired, it doesn't mean that there are no longhaired genes. It is still entirely possible that there will be a longhaired dog. Option B however suggests that the dogs have lost that gene through constant longhaired dogs being born and therefore the gene being 'weeded out' if you will. Edit: My first guess would have been A as well.
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Honestly I would raise question as well.
