Multiple Choice
In a genetic cross between flies heterozygous for body color and wing size, 16% of the offspring show recombinant phenotypes. What is the recombination frequency between the genes for body color and wing size?
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1. Introduction to Genetics
Fundamentals of Genetics
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Which of the following lists correctly identifies the four nitrogenous bases found in RNA?
A
Adenine, Guanine, Thymine, Cytosine
B
Adenine, Uracil, Cytosine, Guanine
C
Adenine, Thymine, Cytosine, Guanine
D
Adenine, Uracil, Cytosine, Thymine
Verified step by step guidance1
Step 1: Understand that RNA (ribonucleic acid) is composed of four nitrogenous bases, which are the building blocks of its nucleotide structure.
Step 2: Recall that the four nitrogenous bases in RNA include Adenine (A), Guanine (G), Cytosine (C), and Uracil (U). Note that Uracil replaces Thymine, which is found in DNA instead.
Step 3: Compare the given options to identify which list contains Adenine, Guanine, Cytosine, and Uracil, without Thymine.
Step 4: Recognize that any list containing Thymine is incorrect for RNA, as Thymine is exclusive to DNA.
Step 5: Conclude that the correct list of nitrogenous bases in RNA is Adenine, Uracil, Cytosine, and Guanine.
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