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
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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
Linked genes always exhibit（）
A. recombination frequencies of less than 50%
B. phenotypes that are similar
C. homozygosity when involved in a testcross
D. a greater number of recombinant offspring than parental offspring when involved in a testcross
E. a lack of recombinant offspring when a heterozygous parent is involved in a testcross
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