Genetics Worksheet BIO-1 Answer the following questions on a separate piece of p
ID: 58190 • Letter: G
Question
Genetics Worksheet BIO-1 Answer the following questions on a separate piece of paper. You MUST SHOW YOUR WORK! In Jurassic Park, blood from dinosaurs was found in mosquitoes trapped in amber. DNA from the blood was used to clone live beasts. If this had been true, we would also have been able to eventually learn much about Jurassic genetics. Let's pretend that. . . It was found that in T. rex a single gene controlled claw shape, and that curled claws were dominant to straight claws (Let C = curled allele and c = straight allele). Give all the possible genotypes and their associated phenotypes. Say you were to cross a pure-breeding curled clawed T. rex with a pure-breeding straight clawed beast. Show the genotypes and phenotypes of the P and F1 animals. You then crossed two of the F1 animals with each other. What genotypic and phenotypic proportions would you expect in the F2?Explanation / Answer
1.
(a) Genotypes - CC , Cc and cc
Phenotypes - CC( Curled claws) , Cc(curled claws) , cc( straight claws)
(b) Punnet square
C C
c Cc Cc
c Cc Cc
Genotypes of P = CC and cc , Phenotypes of P = CC(Curled claws) and cc(straight claws)
Genotype of F1 = Cc Phenotype of F1 = Cc ( Curled claws) because it is dominant over straight claws.
(c)
Punnet square
C c
C CC Cc
c Cc cc
Genotypic ratio = 1 : 2 : 1
Phenotypic ratio = 3 : 1
where genotypic ratio has one homozygous curled clawed , two heterozygous curled clawed and one homozygous straight clawed.
phenotypic ratio is curled clawed : straight clawed.
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