1. There are two alleles coding for the beta-chain of hemoglobin, the normal allele and one coding for the sickle cell variant. Draw a Punnett square showing a cross between a normal individual and a carrier of the sickle-cell allele, between two carriers of the sickle-cell allele.

Question

1.	There are two alleles coding for the beta-chain of hemoglobin, the normal allele and one coding for the sickle cell variant.  Draw a Punnett square showing a cross between a normal individual and a carrier of the sickle-cell allele, between two carriers of the sickle-cell allele.

mphetang · Answer

cross between a normal individual and a carrier: RR &  Rr
                                                                             R   r
                                                                        R   RR  Rr
                                                                        R   RR  Rr
two are normal and two are carriers.

mphetang · Answer

cross between two carriers: Rr & Rr
                                          
                                                  R   r
                                           R     RR Rr
                                           r      Rr  rr
three are carriers and one is infected.

mphetang · Answer

sorry bout that little mistake, one is normal, two are carriers and one is infected.