Total number of test cross offspring Which types of kernels

Total number of test cross offspring =__ Which types of kernels have the parental phenotypes? Which types of kernels have recombinant or non-parental phenotypes? How many of them are there? Draw the crossover that gave rise to the recombinant offspring and draw the resulting recombinant chromosomes. Calculate the map distance between A and Sh = Number of recombinant offspring times 100/Total number of offspring

Solution

Answer:

Total number of test cross offspring= 1609+1554+42+10 = 3215

Parental types of kernels= Red, smooth & Yellow, shrunken

Recombinant or non-parental phenotypes= Red, shrunken & Yellow, smooth

Recombinants = 42 + 10 =52

Red = R; Yellow: r

Smooth= S; Shrunken: s

RS/rs x rs/rs----Test cross

RS/rs & rs/rs ----Parental combinations

Rs/rs & rS/rs----Recombinants

Distance between A and Sh = (52/3215 )*100 = 1.62 map units