In the eastern mosquito fish (which has XX-XY sex determination) spotting is inh
ID: 206095 • Letter: I
Question
In the eastern mosquito fish (which has XX-XY sex determination) spotting is inherited as a Y linked trait. A population of spotted males are mated to non-spotted females which results in 348 offspring. 178 are non-spotted females, 102 are spotted males and 68 are non-spotted males. A) Draw an example pedigree with 5 offspring and label each individual's genotype. How can this pattern be explained? B) In this same population of 348 mosquito fish, all fish have colored gils, with colors ranging from light green to blue, including all colors in between. How can these coloring patterns be explained? 7. What are the three parts of a nucleotide? What are the four types of nucleotides? Which class (purine or pyrimidine) does each fall into? A) How many hydrogen bonds are formed between G&C;? between A & T? 8. Describe the three hypotheses for how DNA replicates. Explain which one is correct and why?Explanation / Answer
7)Nucleotide is composed of Three parts 1.Nitrogenous base 2.Pentose sugar 3.Phospahte group.
Four types of nucleotides are Adenine(A),Guanine(G),Cytosine(C),Thymine(T).
Adenine and Guanine comes under purine and Cytosine,Thymine comes under pyrimidine.
Double bond formed betweem A and T.
Triple bond formed between G and C.
8)Three hypothesis for DNA replcations are as follows
a)Semi conservative-Daughter helix get each parental strand and new starnd.
b)Conservative-One of the daughter helix get parental starnd and another both new strand.
c)Dispersive-The obtained daughter helix contain combination of both new and parental starnds.
Among all three hypothesis the Semi conservative replication is considered as correct.This was experimentaly proved by MESSELSON AND STAHL,1958.