Multiple Choice
In humans, color blindness is an X-linked recessive trait. If a girl's father has normal color vision and her mother is not color blind, what is the probability that the girl will inherit color blindness?
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2. Mendel's Laws of Inheritance
Sex-Linked Genes
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
In the context of DNA structure, which nitrogenous base pairs with adenine?
A
Uracil
B
Guanine
C
Cytosine
D
Thymine
Verified step by step guidance1
Recall that DNA is composed of four nitrogenous bases: adenine (A), thymine (T), guanine (G), and cytosine (C).
Understand that base pairing in DNA follows Chargaff's rules, where adenine pairs specifically with thymine, and guanine pairs with cytosine.
Note that uracil is not found in DNA; it is a base present in RNA and pairs with adenine there instead of thymine.
Therefore, in the DNA double helix, adenine forms hydrogen bonds with thymine, ensuring complementary base pairing.
Summarize that the correct nitrogenous base that pairs with adenine in DNA is thymine.
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