75% rose comb 25% single comb
In chickens rose comb (R) is dominant to single comb (r). A homozygous rose combed rooster is mated with a single combed hen. All of the chicks in the F1 generation were kept together as a group for several years. They were allowed to mate only within their own group. What is the expected phenotype of the F2 chicks

given,

rose combed rooster (R)  ×  single combed hen (r)  

                                     RR × rr

                                          ↓

in F1 generation, all the chicks will be Rr

                                           ↓

in F2 generation, mating was done among their own group of Rr  

          Rr × Rr

               ↓

25% of RR   50% of Rr  and 25% of rr

phenotypes of chicks in f2 generation =  3:1 ( 75% rose combed as R is dominant and 25% single combed)

genotype = 1:2:1 ( 1/4 homozygous rose comb [RR] : 2/4 heterozygous rose comb [Rr] :1/4 homozygous single comb [rr])

answer: zinc is the substance which has a volume of 1.38 .

density is defined as the mass of an object per unit volume.

it can be calculated by dividing mass of a substance by its volume i.e.

si unit of density is kg per cubic meter and cgs unit of the same is gram per cubic centimeter.

now from the given data volume can be calculated by the formula .

hence, the volume of aluminium will be = which comes out to be 1.703 .

similarly, volume of zinc, chromium, and nickel will be 1.378 , 0.869 , and 0.356 respectively.

answer; somatic;