he F2? anti-B that corre- domi- ase? f body pheno- al. The ber ex- gle S al- sto

Question

he F2? anti-B that corre- domi- ase? f body pheno- al. The ber ex- gle S al- storing ygotes. airless y of a g the a. Deduce the blood type of each individual from the data in the table. b. Assign genotypes for the blood groups as aceu- rately as you can from these data, explaining the pattern of inheritance shown in the pedigree Assume that all genetic relationships are as pre- sented in the pedigree (that is, there are no cases false paternity). 32. Three different pure-breeding strains of corn that pro- duce ears with white kernels were crossed to each other. In each case, the Fi plants were all red, while both red and white kernels were observed in the F2 generation in a 9:7 ratio. These results are summa- oss are from p- ld rized in the following table. B ody ld be white-I × white-2 white-I × white-3 white-2 x white-3 red red red 9 red:7 white 9 red:7 white 9 red:7 white nd a. How many genes are involved in determining kernel color in these three strains? b. Define your symbols and show the genotypes for the pure-breeding strains white-1, white-2, and white-3. C. Diagram the cross between white-1 and white-2. showing the genotypes and phenotypes of the F 33. In mice, the A allele of the agouti gene is a recessive allele, but it is dominant for yellow coat color. and F2 progeny. Explain the observed 9:7 ratio. lethal What phenotypes and ratios of offspring would you expect from the cross of a mouse heterozygous at the agouti gene (genotype AA) and also at the albino gene (Co) to an albino mouse (ce) heterozygous at th agouri gene (A'A)?

Explanation / Answer

There are four genes involved in determining kernel colour in these three stains. And interacts like this below-

Colourless precursors ---> enzyme A ( WW or WW) ----> colourless intermediate -----> enzyme B ( RR or Rr) ----> Red kernel

W ( red colour producing) allele is dominant to w ( white)

R ( red colour producing ) allele is dominant to r ( white)

White coloured plants (WWrr) x white coloured plants ( wwRR)

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All Red coloured ( wWRr) .( In f1)

WwRr x WwRr (f1 self crossed)

WWRR( red)

WR Wr wR wr WR

WWRR( red)

WWRr( red) WwRR(red) WwRr( red) Wr WWRr( red) WWrr ( white) WwRr(red) Wwrr(white) wR WwRR ( red) WwRr ( red) wwRR( white) wwRr ( white wr WwrR ( red) wWrr ( white) wwRr( white) wwrr( white)

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