Why is Duchenne muscular dystrophy less common in females than males?
What will be an ideal response?
The condition is X-linked recessive. For a woman to have this disorder, she would have to receive it in both her X chromosomes, meaning that both parents had to pass it via their X chromosomes. A male only has to receive the disorder on his single X chromosome to express the trait.
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Which of the following is true of nucleosome structure?
A. Nucleosomes are composed of about 1,000 bp of DNA wrapped around a histone core. B. Nucleosomes are composed of about 200 bp of DNA wrapped around a histone core. C. The DNA wraps around the core nearly two times, forming a right-handed solenoidal supercoil. D. The DNA wraps around the core nearly three times, forming a left-handed solenoidal supercoil. E. None of these choices is correct.
Isotopes of the same element differ from each other in the number of
a. electrons and protons. b. neutrons only. c. protons and neutrons. d. electrons only. e. protons, neutrons, and electrons.
The lineages Anura, Caudata, and Gymnophiona are all part of which of the following group?
a. Testudines b. Archosauromorpha c. Squamata d. Sphenodontia e. Amphibia
Four of the five plants listed below are seed bearers
Select the exception. a. ferns b. conifers c. eudicots d. ginkgos e. monocots