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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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
The himalayan allele in rabbits produces dark fur at the extremities of the body—on the nose, ears, and feet. The dark pigment develops, however, only when a rabbit is reared at a temperature of 25°C
A. temperature-sensitive allele
B. dominance
C. discontinuous characteristic
D. genetic imprinting
E. phenocopy
Multifactorial traits are influenced by_and___（）
A. multiple genes; environment
B. dominance; codominance
C. epistasis; pleiotropy
D. age; sex
E. genetic imprinting; reduced penetrance
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