What is the genotypic ratio of dwarf palnts which always produce dwarf offspring?
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By a ratio of 1:1, I'm going to assume you mean that there is an equal distribution of tall and dwarf offspring pea plants.
Now, let’s get to the problem. First off, you need to be aware of the fact that in pea plants, the tall phenotype is dominant, while dwarf or short ones are recessive. As per usual, there as two alleles of a single gene within a cell, and for this example, those two are T, for the tall allele, and t, for the short allele.
So, to begin with, we know the parents phenotype, and also that of the offspring. This automatically narrows down the genotype choices; the dwarf parent has to be t/t to be a dwarf. But we also know that half of the offspring are dwarfs, too, meaning that the other parent has to carry a t allele as well, because otherwise there wouldn’t have been a second t allele to have dwarf offspring.
i hope help you
Now, let’s get to the problem. First off, you need to be aware of the fact that in pea plants, the tall phenotype is dominant, while dwarf or short ones are recessive. As per usual, there as two alleles of a single gene within a cell, and for this example, those two are T, for the tall allele, and t, for the short allele.
So, to begin with, we know the parents phenotype, and also that of the offspring. This automatically narrows down the genotype choices; the dwarf parent has to be t/t to be a dwarf. But we also know that half of the offspring are dwarfs, too, meaning that the other parent has to carry a t allele as well, because otherwise there wouldn’t have been a second t allele to have dwarf offspring.
i hope help you
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