Question

Student Guide Corn Dihybrid Genetics BioKit Date s 20.5 NERT TUES Dny In this of com c you will sudy diyrid inheritane tre anaving hno of Fa n Obtein ne er of corn for set of teo membere on r tem De nor remove ar from the ear Notioe that son end P pigmented layer wiithin me rple nd oere ae yeowTe rle e upon drying w e shows through Swet co er ls p d r e purple and weet ven- ins remain smom An inv win mer e and man she velow and starchy, or yellow and sweet. RECORDING DATA Working in pairs, count and record in Tabile 1 the mber of grains of eh phanetvpe One person shou ld call out the phenotypes while Put a colored marker pin in the and other records them in the table Put an uncolored row marker pin in the end e of grains and count and record the phenotvoes is ing After each row ext row and continue colne eted, move the row marker pin to the red pin. next row untit vou return to the row markaed by the When finished, combine the totals for each phenotype under "Phenotype Class in Table 2. Then record the ounted by your seam and recod them number of grains counted. DATA INTERPRETATION Examine the totals obtained by your team, which are the dominant p 1n.L esss dsmirenh orvpes ueoce a and B1aLK How do you know? tN umCES deKLma pnenetuecS The corn grains are an F generation resulting from a cross between a homozygous purple and starchy com (R/R Su/Su) and a corn that is homozygous yeilow and sweet irr auu. To better understand how these ears were produced, fill in the following by placing the symbol for an allele in each blank. R-gene for color (purple) r-gene for colorless (yellow Su-gene for starchy gy-gene for sweet ... Y SAL/S Parents x F1 F, Cross 7

Answer 1

In corns dominant kernel colour is Purple and for starchy corn is dominant. ( here data is not given but usually dominant traits are written in Capital letters.

R/Su:R/Su * r/su:r/su ( parents)

R/Su:r/su (F1)

R/Su:r/su * R/Su:r/su ( F1 Cross)

	RSu	Rsu	rSu	rsu
RSu	R/Su R/Su (pruple, starchy)	R/su: R/Su(pruple, starchy)	r/Su:R/Su (pruple, starchy)	R/Su:r/su(purple, starchy)
Rsu	R/Su R/su (pruple, starchy)	R/su:Rsu (purple, sweet)	r/Su: R/su (pruple, starchy)	R/su:r/su (purple, sweet)
rSu	R/Su:r/Su (pruple, starchy)	r/Su:R/su (pruple, starchy)	r/Su:r/Su (yellow, starchy)	r/Su:r/su (yellow, starchy)
rsu	R:Su/r:su (pruple, starchy)	r/su:R/su (purple, sweet)	r/Su:r/su (yellow, starchy)	r/su: r/su (yellow, sweet)