Genetics Midterm II UPDATED Exam
Questions and CORRECT Answers
Pseudodominance - CORRECT ANSWER - the expression of a normally recessive
mutation
pseudoautosomal region - CORRECT ANSWER - small region on the X and Y
chromosomes that contains homologous gene sequences
Sex-limited trait - CORRECT ANSWER - A trait that affects a structure or function
present in only one sex
Sex-influenced trait - CORRECT ANSWER - a trait that is influenced by the presence of
male or female sex hormones
Chiasma - CORRECT ANSWER - site of crossing over
Gene-gene interaction - CORRECT ANSWER - Studies that focus on the interdependence
of two or more genes in influencing characteristics, behavior, diseases, and development
Epistasis - CORRECT ANSWER - A type of gene interaction in which one gene alters the
phenotypic effects of another gene that is independently inherited.
Dominant allele enzymatic activity - CORRECT ANSWER - Produces active active
enzyme
Recessive allele enzymatic activity - CORRECT ANSWER - Produces little to no active
enzyme
, One gene-one enzyme hypothesis - CORRECT ANSWER - Each gene controls the
synthesis or activity of a single enzyme
Pleiotropy - CORRECT ANSWER - A single gene having multiple effects on an
individuals phenotype
Complementation - CORRECT ANSWER - Two different mutations in the heterozygous
condition are exhibited as the wild-type phenotype; indicates that the mutations are at different
loci.
Haplosufficient - CORRECT ANSWER - Once copy of a gene produces enough active
enzymes for normal function in heterozygotes
Haploinsufficent - CORRECT ANSWER - One copy of gene does not produce enough
active enzymes for normal function in heterozygotes
Two-point mapping - CORRECT ANSWER - Mapping involving two linked genes
Three-point mapping - CORRECT ANSWER - mapping three linked genes in a single
cross
Ptot - CORRECT ANSWER - P*P
Expected double crossover product - CORRECT ANSWER - Pdouble * Ptot
coefficient of coincidence (CoCo) - CORRECT ANSWER - (observed double
crossover)/(expected double crossover)
Interference - CORRECT ANSWER - 1 - coefficient of coincidence
Questions and CORRECT Answers
Pseudodominance - CORRECT ANSWER - the expression of a normally recessive
mutation
pseudoautosomal region - CORRECT ANSWER - small region on the X and Y
chromosomes that contains homologous gene sequences
Sex-limited trait - CORRECT ANSWER - A trait that affects a structure or function
present in only one sex
Sex-influenced trait - CORRECT ANSWER - a trait that is influenced by the presence of
male or female sex hormones
Chiasma - CORRECT ANSWER - site of crossing over
Gene-gene interaction - CORRECT ANSWER - Studies that focus on the interdependence
of two or more genes in influencing characteristics, behavior, diseases, and development
Epistasis - CORRECT ANSWER - A type of gene interaction in which one gene alters the
phenotypic effects of another gene that is independently inherited.
Dominant allele enzymatic activity - CORRECT ANSWER - Produces active active
enzyme
Recessive allele enzymatic activity - CORRECT ANSWER - Produces little to no active
enzyme
, One gene-one enzyme hypothesis - CORRECT ANSWER - Each gene controls the
synthesis or activity of a single enzyme
Pleiotropy - CORRECT ANSWER - A single gene having multiple effects on an
individuals phenotype
Complementation - CORRECT ANSWER - Two different mutations in the heterozygous
condition are exhibited as the wild-type phenotype; indicates that the mutations are at different
loci.
Haplosufficient - CORRECT ANSWER - Once copy of a gene produces enough active
enzymes for normal function in heterozygotes
Haploinsufficent - CORRECT ANSWER - One copy of gene does not produce enough
active enzymes for normal function in heterozygotes
Two-point mapping - CORRECT ANSWER - Mapping involving two linked genes
Three-point mapping - CORRECT ANSWER - mapping three linked genes in a single
cross
Ptot - CORRECT ANSWER - P*P
Expected double crossover product - CORRECT ANSWER - Pdouble * Ptot
coefficient of coincidence (CoCo) - CORRECT ANSWER - (observed double
crossover)/(expected double crossover)
Interference - CORRECT ANSWER - 1 - coefficient of coincidence
