BSC 1005 EXAM #3 QUESTIONS AND
ANSWERS (VERIFIED AND UPDATED)
Phenotype - ANS an individual's observable traits.
Genotype - ANS genetic factors responsible for phenotype.
Gene - ANS a region of DNA, which is inherited. Contains units of information about specific
traits.
Allele - ANS alternative forms of a gene that determine the expression of some particular
characteristic e.g. flower color red or white.
Locus - ANS a specific position or location on a chromosome.
Phenotype is dependent upon - ANS the relationship between two genes present.
Gregor Mendel - ANS conducted experimental crosses with pea plants.
Complete dominance - ANS the dominant allele expressed whenever present, either alone,
or in a pair. The recessive allele makes no contribution to the phenotype.
@2026/2027 ALLRIGHTS RESERVED.
, Incomplete dominance - ANS In heterozygous condition, when both alleles have certain
effect on the phenotype.
Codominance - ANS in a heterozygous condition, phenotypes of both alleles are expressed at
the same time.
Pleiotropy - ANS the ability of a gene to affect an organism in many ways.
Sickle cell anemia - ANS Pleiotropy; deformed red blood cells, can only carry half the amount
of nutrients
Cystic fibrosis - ANS Pleiotropy; thick mucus
Marfan syndrome - ANS Pleiotropy; lack of elasticity in the muscle cells.
Epistasis - ANS effect of many genes on the expression of one trait aka polygenic inheritance;
link to karyotype. Color is a result of interactions among several gene products. Ex. human eye
color
continuous variation - ANS an additive effect of two or more genes on a single phenotype
character. The traits occur in a range of small differences. Environmental factors are involved.
Multiple allele system - ANS the expression of different phenotypes due to the presence of
multiple alleles.
Universal donor - ANS blood type O
@2026/2027 ALLRIGHTS RESERVED.
ANSWERS (VERIFIED AND UPDATED)
Phenotype - ANS an individual's observable traits.
Genotype - ANS genetic factors responsible for phenotype.
Gene - ANS a region of DNA, which is inherited. Contains units of information about specific
traits.
Allele - ANS alternative forms of a gene that determine the expression of some particular
characteristic e.g. flower color red or white.
Locus - ANS a specific position or location on a chromosome.
Phenotype is dependent upon - ANS the relationship between two genes present.
Gregor Mendel - ANS conducted experimental crosses with pea plants.
Complete dominance - ANS the dominant allele expressed whenever present, either alone,
or in a pair. The recessive allele makes no contribution to the phenotype.
@2026/2027 ALLRIGHTS RESERVED.
, Incomplete dominance - ANS In heterozygous condition, when both alleles have certain
effect on the phenotype.
Codominance - ANS in a heterozygous condition, phenotypes of both alleles are expressed at
the same time.
Pleiotropy - ANS the ability of a gene to affect an organism in many ways.
Sickle cell anemia - ANS Pleiotropy; deformed red blood cells, can only carry half the amount
of nutrients
Cystic fibrosis - ANS Pleiotropy; thick mucus
Marfan syndrome - ANS Pleiotropy; lack of elasticity in the muscle cells.
Epistasis - ANS effect of many genes on the expression of one trait aka polygenic inheritance;
link to karyotype. Color is a result of interactions among several gene products. Ex. human eye
color
continuous variation - ANS an additive effect of two or more genes on a single phenotype
character. The traits occur in a range of small differences. Environmental factors are involved.
Multiple allele system - ANS the expression of different phenotypes due to the presence of
multiple alleles.
Universal donor - ANS blood type O
@2026/2027 ALLRIGHTS RESERVED.
