WGU C653 HEREDITY AND GENETICS
ACTUAL TEST QUESTIONS WITH
COMPLETE ANSWER KEY
●● Allele
Answer: Any one of two or more genes that may occur at a given site on
a chromosome.
Occurs in pairs - dominant/recessive
●● Phenotype
Answer: Observable characteristics in regards to its genotype
●● Genotype
Answer: Genetic constitution of an individual organism.
Example:
DD - Homozygous
Dd - Heterozygous
dd - Homozygous
●● Heterozygous
Answer: having two different alleles for a trait
,●● Homozygous
Answer: An organism that has two identical alleles for a trait
●● Dominant
Answer: An allele that is always expressed
●● Recessive
Answer: An allele that is masked when a dominant allele is present
●● Prophase 1
Answer: Chromosomes become visible; nuclear envelope breaks down;
crossing-over occurs.
●● Metaphase 1
Answer: Paired homologous chromosomes line up across the center of
the cell
●● Anaphase 1
Answer: Homologous pairs are pulled apart to the opposite poles of the
cell. The sister chromatids are still in tact.
●● Telophase 1 and cytokinesis (meiosis)
, Answer: nuclear membrane forms again and spindle fibers disassemble
then the cell undergoes cytokinesis and divides.
●● Prophase 2
Answer: A new spindle forms around the chromosomes
●● Metaphase 2
Answer: Centromeres of chromosomes line up randomly at the equator
of each cell.
●● Anaphase 2
Answer: sister chromatids separate and move to opposite poles
●● Telophase 2 and Cytokinesis
Answer: A nuclear envelope forms around each set of chromosomes. the
cytoplasm divides.
And
four haploid daughter cells result
●● crossing over
Answer: the exchange of genes between homologous chromosomes,
resulting in a mixture of parental characteristics in offspring. All
possible combinations creat an "independent assortment"
ACTUAL TEST QUESTIONS WITH
COMPLETE ANSWER KEY
●● Allele
Answer: Any one of two or more genes that may occur at a given site on
a chromosome.
Occurs in pairs - dominant/recessive
●● Phenotype
Answer: Observable characteristics in regards to its genotype
●● Genotype
Answer: Genetic constitution of an individual organism.
Example:
DD - Homozygous
Dd - Heterozygous
dd - Homozygous
●● Heterozygous
Answer: having two different alleles for a trait
,●● Homozygous
Answer: An organism that has two identical alleles for a trait
●● Dominant
Answer: An allele that is always expressed
●● Recessive
Answer: An allele that is masked when a dominant allele is present
●● Prophase 1
Answer: Chromosomes become visible; nuclear envelope breaks down;
crossing-over occurs.
●● Metaphase 1
Answer: Paired homologous chromosomes line up across the center of
the cell
●● Anaphase 1
Answer: Homologous pairs are pulled apart to the opposite poles of the
cell. The sister chromatids are still in tact.
●● Telophase 1 and cytokinesis (meiosis)
, Answer: nuclear membrane forms again and spindle fibers disassemble
then the cell undergoes cytokinesis and divides.
●● Prophase 2
Answer: A new spindle forms around the chromosomes
●● Metaphase 2
Answer: Centromeres of chromosomes line up randomly at the equator
of each cell.
●● Anaphase 2
Answer: sister chromatids separate and move to opposite poles
●● Telophase 2 and Cytokinesis
Answer: A nuclear envelope forms around each set of chromosomes. the
cytoplasm divides.
And
four haploid daughter cells result
●● crossing over
Answer: the exchange of genes between homologous chromosomes,
resulting in a mixture of parental characteristics in offspring. All
possible combinations creat an "independent assortment"
