BSC1005 Exam 4 questions and answers
graded A+ updated
Does the Y chromosome contain a lot of genes? - correct answer ✔✔No, it contains few genes
Does the Y chromosome undergo recombination during meiosis? - correct answer ✔✔No
What can Y chromosome analysis be used for? - correct answer ✔✔Study human evolution,
trace ancestry, and identify paternity by comparing DNA sequences
What was the Thomas Jefferson pedigree? - correct answer ✔✔It was an analysis of STR's on
the Y chromosome. It proved that the father of Eston Hemmings was a Jefferson.
What is incomplete dominance? - correct answer ✔✔A form of inheritance where
heterozygotes have a phenotype that is intermediate between homozygous dominant and
recessive
What is an example of incomplete dominance? - correct answer ✔✔Severe disease = HH
Mild disease = Hh
Normal = hh
What is co-dominance? - correct answer ✔✔Both maternal and paternal alleles contribute
equally to the phenotype
What is an example of co-dominance? - correct answer ✔✔Blood types A and B
,What does RH (+) or (-) refer to? - correct answer ✔✔The presence of RH proteins on the
surface of red blood cells
What is a polygenic trait? - correct answer ✔✔A single trait determined by the interaction
between alleles of more than one gene
What is an example of a polygenic trait? - correct answer ✔✔Height, which is determined by
400+ genes
What is continuous variation? - correct answer ✔✔Range of variable phenotypes rather than
discrete categories
What is a multifactorial trait? - correct answer ✔✔Interactions between gene(s) and
environment contribute to a phenotype
What is an example of a multifactorial trait? - correct answer ✔✔Stress and mental
development
What causes a multifactorial trait? - correct answer ✔✔Alleles or serotonin transport protein
interact with the environment
What is a serotonin transport protein? - correct answer ✔✔One allele increase susceptibility to
environmental stress
What errors can occur during meiosis? - correct answer ✔✔Nondisjunct and aneuploidy
What is nondisjunct? - correct answer ✔✔Failure of chromosomes to separate during cell
division
, What is aneuploidy? - correct answer ✔✔An abnormal number of one or more chromosomes
What is an example of aneuploidy? - correct answer ✔✔Down syndrome
Does the risk of nondisjunct and aneuploidy increase with maternal age? - correct answer
✔✔Yes
What is amniocentesis? - correct answer ✔✔Removal of fluid surrounding fetus to obtain and
analyze fetal cells to diagnose genetic disorders
What is a population? - correct answer ✔✔Group of organisms living together in the same
geographic area
Can an entire population change when some traits are favored over others? - correct answer
✔✔Yes
What is evolution? - correct answer ✔✔Allele frequency changes over time
What type of allele frequencies does a genetically diverse population have? - correct answer
✔✔Different allele frequencies
Does an environment favor alleles? - correct answer ✔✔Yes
What is fitness? - correct answer ✔✔An organisms ability to survive and reproduce in a
particular environment
What is higher fitness? - correct answer ✔✔Increased likelihood of alleles being passed to the
next generation
graded A+ updated
Does the Y chromosome contain a lot of genes? - correct answer ✔✔No, it contains few genes
Does the Y chromosome undergo recombination during meiosis? - correct answer ✔✔No
What can Y chromosome analysis be used for? - correct answer ✔✔Study human evolution,
trace ancestry, and identify paternity by comparing DNA sequences
What was the Thomas Jefferson pedigree? - correct answer ✔✔It was an analysis of STR's on
the Y chromosome. It proved that the father of Eston Hemmings was a Jefferson.
What is incomplete dominance? - correct answer ✔✔A form of inheritance where
heterozygotes have a phenotype that is intermediate between homozygous dominant and
recessive
What is an example of incomplete dominance? - correct answer ✔✔Severe disease = HH
Mild disease = Hh
Normal = hh
What is co-dominance? - correct answer ✔✔Both maternal and paternal alleles contribute
equally to the phenotype
What is an example of co-dominance? - correct answer ✔✔Blood types A and B
,What does RH (+) or (-) refer to? - correct answer ✔✔The presence of RH proteins on the
surface of red blood cells
What is a polygenic trait? - correct answer ✔✔A single trait determined by the interaction
between alleles of more than one gene
What is an example of a polygenic trait? - correct answer ✔✔Height, which is determined by
400+ genes
What is continuous variation? - correct answer ✔✔Range of variable phenotypes rather than
discrete categories
What is a multifactorial trait? - correct answer ✔✔Interactions between gene(s) and
environment contribute to a phenotype
What is an example of a multifactorial trait? - correct answer ✔✔Stress and mental
development
What causes a multifactorial trait? - correct answer ✔✔Alleles or serotonin transport protein
interact with the environment
What is a serotonin transport protein? - correct answer ✔✔One allele increase susceptibility to
environmental stress
What errors can occur during meiosis? - correct answer ✔✔Nondisjunct and aneuploidy
What is nondisjunct? - correct answer ✔✔Failure of chromosomes to separate during cell
division
, What is aneuploidy? - correct answer ✔✔An abnormal number of one or more chromosomes
What is an example of aneuploidy? - correct answer ✔✔Down syndrome
Does the risk of nondisjunct and aneuploidy increase with maternal age? - correct answer
✔✔Yes
What is amniocentesis? - correct answer ✔✔Removal of fluid surrounding fetus to obtain and
analyze fetal cells to diagnose genetic disorders
What is a population? - correct answer ✔✔Group of organisms living together in the same
geographic area
Can an entire population change when some traits are favored over others? - correct answer
✔✔Yes
What is evolution? - correct answer ✔✔Allele frequency changes over time
What type of allele frequencies does a genetically diverse population have? - correct answer
✔✔Different allele frequencies
Does an environment favor alleles? - correct answer ✔✔Yes
What is fitness? - correct answer ✔✔An organisms ability to survive and reproduce in a
particular environment
What is higher fitness? - correct answer ✔✔Increased likelihood of alleles being passed to the
next generation
