GENETICS Please Help! The answers have been provided under the questions but I r
ID: 168591 • Letter: G
Question
GENETICS Please Help! The answers have been provided under the questions but I really need to see the work/explanation for each as I do not understand. Thank you very much!!
80. After a cross between two mice, the F1 offspring all had the same phenotype. The F2 consisted of 91 short tails and 29 normal tails. Identify the phenotypes and genotypes of the two parent mice.
Answer:
Parent A SS/Short tails
Parent B ss/Long tails
83. In some plants, a purple pigment is synthesized from a colorless precursor. In a cross between two plants, one purple and the other colorless, an F1 generation was produced that was all-purple. The F2 produced from the F1 had 775 purple, 200 red and 65 colorless. What is the genotype of the parents?
The ratio is 12:3:1; Parents: AABB × aabb
1,2, and 3: Aa
4: aa
I'm always confused with these pedigree questions. How do you label? Thanks
What are the possible genotypes of persons 1, 2, 3 and 4?Explanation / Answer
Ques-1:
80. After a cross between two mice, the F1 offspring all had the same phenotype. The F2 consisted of 91 short tails and 29 normal tails. Identify the phenotypes and genotypes of the two parent mice.
Answer:
Parent A SS/Short tails
Parent B ss/Long tails
Answer:
The monohybrid cross of Parent A (SS/short tails - dominant) with Parent B (ss/long tails – recessive) generates 3:1 ratio of dominant : recessive phenotypes in which short tails of phenotypes total 91 whereas 29 recessive phenotypes. Therefore, the following the crosses that generates this types of ratio
SS X ss
S S s s
Ss Ss Ss Ss ---> F1 generation all are short tailed now cross between two F1 phenotypes
Ss x Ss
S s S s
SS Ss Ss ss --->3:1 ratio of 91 dominant short tails and 29 recessive long tails phenotypes
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