In corn, the genes for tassel length (alleles T and t) andrust resistance (alleles R and r) are known to be on separate chromosomes. In the course of making routinecrosses, a breeder noticed that one T/t ; R/r plant gaveunusual results in a testcross with the double-recessivepollen parent t/t ; r/r. The results wereProgeny: T/t ; R/r 98t/ t ; r/r 104T/t ; r/r 3t/t ; R/r 5Corncobs: Only about half as many seeds as usuala. What key features of the data are different from theexpected results?b. State a concise hypothesis that explains the results.c. Show genotypes of parents and progeny.d. Draw a diagram showing the arrangement of alleleson the chromosomes.e. Explain the origin of the two classes of progenyhaving three and five members.
In corn, the genes for tassel length (alleles T and t) and
rust resistance (alleles R and r) are known to be on separate chromosomes. In the course of making routine
crosses, a breeder noticed that one T/t ; R/r plant gave
unusual results in a testcross with the double-recessive
pollen parent t/t ; r/r. The results were
Progeny: T/t ; R/r 98
t/ t ; r/r 104
T/t ; r/r 3
t/t ; R/r 5
Corncobs: Only about half as many seeds as usual
a. What key features of the data are different from the
expected results?
b. State a concise hypothesis that explains the results.
c. Show genotypes of parents and progeny.
d. Draw a diagram showing the arrangement of alleles
on the chromosomes.
e. Explain the origin of the two classes of progeny
having three and five members.
Trending now
This is a popular solution!
Step by step
Solved in 4 steps with 1 images
