In a__ the modules are arranged in a vertical stack. Each layer in the stack performs a related subset of the functions required to communicate with another system（）
A. protocol architecture
B. NSP
C. protocol data unit
D. frame relay
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A genetic map shows which of the following（）
A. the linear order of genes on a chromosome
B. the distance in numbers of nucleotides between two genes
C. the number of genes on each of the chromosomes of a species
D. the location of chromosomes in the nucleus when they line up at metaphase during mitosis
E. the location of double crossovers that occur between two genes
Recombination occurs through（）
A. crossing over and independent assortmen
B. crossing over and chromosome interference
C. chromosome interference and independent assortment
D. somatic-cell hybridization and chromosome interference
E. complete linkage and chromosome interference
Leber hereditary optic neuropathy （LHON） is a human disease that exhibits cytoplasmic inheritance. It is characterized by rapid loss of vision in both eyes, resulting from the death of cells in the op
A. a mitochondrial gene from the mother
B. a nuclear gene from the father
C. a nuclear gene from the mother
D. a mitochondrial gene from the father
Linked genes（）
A. co-segregate
B. assort randomly
C. can crossover and recombine
D. are allelic
E. will segregate independently
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