Astudent analyzed ears of corn that demonstrated two traits in the f2 kernels, purple or white colors and smooth or wrinkled shapes. a tabulation of 135 individual kernels gave the following results: purple and smooth = 75 white and smooth = 28 purple and wrinkled = 24 white and wrinkled = 8 what would be the only phenotype present in the f1 generation?

It is known that the in dihybrid cross (a cross between two different traits), the phenotypic ratio between the offspring of two heterozygous parents in the F2 generation is 9:3:3:1.

purple and smooth = 75                (≈ 9 · 8)

white and smooth = 28                  (≈ 3 · 8)

purple and wrinkled = 24               (= 3 · 8)

white and wrinkled = 8                   (= 1 · 8)

So, the ratio between the offspring is close to 9:3:3:1 in F2 generation.

This means, that the only heterozygotes are present in the F1 generation, and they must be purple and smooth.

ans.

dna fingerprinting is defined as a process that determines the dna characteristics of an individual. these dna characteristics are unique among individuals as their fingerprints, so it is known as dna fingerprinting.

steps of dna fingerprinting includes extraction of dna from sample, amplification of dna, restriction digestion of amplified dna, and then analysis of dna by gel electrophoresis, respectively.

thus, the next step performed by the scientist is 'to cut the amplified dna (obtained by polymerase chain reaction) by restriction enzymes that cleave the dna into fragments and their analysis.'

sound moves fastest in solids because the molecules are tightly packed and it allows sound to vibrate