Please answer the following questions: These two pairs of alleles are linked on
ID: 262992 • Letter: P
Question
Please answer the following questions: These two pairs of alleles are linked on chromosome 2 in tomato: O round fruit P smooth fruit skin o ovate fruit p peach fruit skin A testcross between a heterozygous " smooth & round " pistillate plant ( female parent) and a "peach & ovate " staminate plant (male parent) produced the following progeny: peach & round 57 smooth & ovate 63 Smooth & round 420 460 Peach & ovate a) Which are the crossover progeny ( recombinant)? Give the parental (non recombinant) and recombinant progeny genotype and the frequency for each? What is the map distance in map units between loci o and p? b) c)Explanation / Answer
A) recombinant progeny are peach & round (57) and smooth & ovate (63)
B) genotype for parental-
smooth&round= PpOo ; peach&ovate= ppoo
genotype for recombinants-
peach&round= ppOo ; smooth&ovate=Ppoo
frequency for genotype:= 4:4:4:4
c). map distance= (total no. of recombinants/ total no. of progeny) x 100
total recombinants= 57+63= 120
total no. of progeny= 57+63+ 420+460= 1000
map distance= (120/1000) x 100= 12 map units.