One of my friend took it during our Stats exam, and I think they allowed him to
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Biology; Chemistry; Physics: Post your doubts here!
- Thread starter scouserlfc
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Can somebody please tell me step by step points for how to prepare a microscopic slide?
Depends on what you are observing (pollen, leaf epidermis. etc)
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what is the difference? please tell me for both if you can otherwise just the common points
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Need help..... invstigations related to GERMINATION? can anybody help me out pleaseeeeeee
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(d) You are provided with two pure-breeding varieties of the same crop plant; one is resistant to weed-killer and the other is non-resistant.
Explain how you would carry out a genetic experiment to determine whether the resistance is dominant or recessive. [5]
I dont get questions like these :/ help please?
Explain how you would carry out a genetic experiment to determine whether the resistance is dominant or recessive. [5]
I dont get questions like these :/ help please?
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Where did u see this? :O
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Its from June 2002's ATP paper, I want to send you the link lekin I can't find it online. :/ Do look if you have the past papers.
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ahaan.. i actually followed atps from 2007-2013 s was quite stunned
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I solved this a few days ago. If you could give me a few minutes I can look it up and answer you
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Ihope not to see dis investigation in paperThank you so much.But please do explain as well..
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I don't get this as well! High five! But read it from the pure. You'll get it. Some of it. lol. Like I did. But if someone gets it, please explain this stupid question which so will not come tomorrow hopefully and Inshaa Allah.
Cross breed the resistant plant with the non resistance plant. You would then get heterozygous plants. Crossbreed these heterozygous plants. Spray the offspring with weed killer and if you get 1/4 of the plants still living, then the resistance gene is resessive. If you get 3/4 of the plants still living then the resistance gene is dominant.
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Okay so you know how plant offspring are genetically identical to the parent plant? And you do know that the ratio of Mendel's crosses is 3:1 right?
So keeping these in mind, you will cross resistant plants with non-resistant plants. The F1 generation produced will be checked for resistance to weed killer. If all the offspring are resistant then it means that the resistant trait is dominant over the non-resistant trait. The offspring of F1 generation will be further crossed with each other i.e dominants will be crossed with dominants. This will be the F2 generation in which the ratio of resistant to non-resistant will be 3:1. So considering this ratio , the allele for resistant is dominant and allele for non-resistant is recessive.
I hope you got it!
So keeping these in mind, you will cross resistant plants with non-resistant plants. The F1 generation produced will be checked for resistance to weed killer. If all the offspring are resistant then it means that the resistant trait is dominant over the non-resistant trait. The offspring of F1 generation will be further crossed with each other i.e dominants will be crossed with dominants. This will be the F2 generation in which the ratio of resistant to non-resistant will be 3:1. So considering this ratio , the allele for resistant is dominant and allele for non-resistant is recessive.
I hope you got it!
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You posted some other notes too, earlier, some days ago for Bio atp. There were 3 files. You said you found them on some thread.
Where are they? I really need them. :/
Two pure-breeding varieties means that both of the varieties will be homozygous, whether homozygous dominant or recessive.
You cross the two pure-breeding varieties.
The first filial generation or the the offspring of the cross will be heterozygous.
The heterozygous offspring is then inter crossed (Hetrozygous x Hetrozygous)
The phenotype ratio is observed by applying weed killer. (Counting the plants)
The one who's ratio is greater is the dominant one. (As it's monohybrid inheritance it's gonna be more like 3:1)
YY x yy
First Filial = Yy
Yy x Yy
YY Yy Yy yy
3:1 phenotypic ratio is observed.
Is there any specific purpose of crossing them 2 times?
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Okay so you know how plant offspring are genetically identical to the parent plant? And you do know that the ratio of Mendel's crosses is 3:1 right?Thank you so much.
So keeping these in mind, you will cross resistant plants with non-resistant plants. The F1 generation produced will be checked for resistance to weed killer. If all the offspring are resistant then it means that the resistant trait is dominant over the non-resistant trait. The offspring of F1 generation will be further crossed with each other i.e dominants will be crossed with dominants. This will be the F2 generation in which the ratio of resistant to non-resistant will be 3:1. So considering this ratio , the allele for resistant is dominant and allele for non-resistant is recessive.
I hope you got it!
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Umm because in the first filial generation all the offspring are with the dominant trait. If you cross them second time you will be able to prove the ratio which is 3:1 and youll be also able to tell that the other trait is resistant