In peas, TallIn peas, Tall (T) is dominant over dwarf (t), Yellow is dominant over green (y), and Smooth (S) is dominant over wrinkled (s). What fraction of the offspring in the following cross would be homozygous recessive for all gene pairs in the cross: YyTtss x YyttSs?
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(1) YyTtss will provide 4 type of gametes YTs,Yts,yTs and yts.(2) YyttSs will also provide 4 type of gametes YtS,Yts,ytS and yts
(3) So,As per punnet square:- Cross between YyTtss and YyttSs will produce 16 progenies in next generation.
(4) Because the gametes carrying all 3 recessive alleles for all 3 traits is one from each parent, by union of 2 yts,the progenies having all recessive traits that is of Genotype yyttss will only be 1 out of 16 in next generation. The proportion of Genotype As well as phenotype of green,dwarf and wrinkled plants will only be 1:16.Hope it helps.
(3) So,As per punnet square:- Cross between YyTtss and YyttSs will produce 16 progenies in next generation.
(4) Because the gametes carrying all 3 recessive alleles for all 3 traits is one from each parent, by union of 2 yts,the progenies having all recessive traits that is of Genotype yyttss will only be 1 out of 16 in next generation. The proportion of Genotype As well as phenotype of green,dwarf and wrinkled plants will only be 1:16.Hope it helps.
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