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
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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
What phenomenon describes a genetic trait that is expressed more strongly or earlier in development with each generation（）
A. anticipation
B. epigenetics
C. maternally determined progeny phenotypes
D. epistasis
In order to determine if mutations from different organisms that exhibit the same phenotype are allelic, which test would you perform（）
A. complementation test
B. test cross
C. epistasis test
D. allelic series test
E. biochemical test
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