LSU BIOLOGY 1201 TEST QUESTIONS WITH CORRECT DETAILED ANSWERS – UPDATED!!!
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Course
LSU BIOLOGY 1201
Institution
LSU BIOLOGY 1201
LSU BIOLOGY 1201 TEST QUESTIONS WITH CORRECT DETAILED ANSWERS – UPDATED!!!
What occurs in prophase 2? - Answer-if the chromosomes decondensed in telophase 1, they condense again. if nuclear envelopes formed, they are fragmented into pieces. the centrosomes that were duplicated during interphase ...
LSU BIOLOGY 1201 TEST QUESTIONS
WITH CORRECT DETAILED ANSWERS –
UPDATED!!!
What occurs in prophase 2? - Answer-if the chromosomes decondensed in telophase 1,
they condense again. if nuclear envelopes formed, they are fragmented into pieces. the
centrosomes that were duplicated during interphase 1 move away from each other
toward opposite poles and new spindles are formed
What occurs in metaphase 2? - Answer-the sister chromatids are maximally condensed
and aligned at the equator of the cell
What occurs in anaphase 2? - Answer-the sister chromatids are pulled apart by the
kinetochore microtubules and move toward opposite poles. non-kinetochore
microtubules elongate the cell
What occurs in telophase 2? - Answer-chromosomes arrive at opposite poles;
decondense; nuclear envelopes form around chromosomes. cytokinesis separates the
two cells into 4 unique haploid cells
alleles - Answer-an alternate form of genes
homozygous allele - Answer-having 2 identical alleles for a trait
heterozygous allele - Answer-having 2 different alleles for a trait
genotype - Answer-the genetic makeup of an individual
phenotype - Answer-the physical appearance of a trait
dominant allele - Answer-allele that is fully expressed in the phenotype of a
heterozygote; represented by a capital letter; only one copy of the allele is required to
express the trait
recessive allele - Answer-the allele that is completely masked or not expressed in the
phenotype of a heterozygote; represented by lower case letter
what do recessive alleles often code for? - Answer-inactive or defective enzymes
what are the generations in mendelian inheritance? - Answer-parental, filial one, filial
two
what is filial one? - Answer-offspring of the parental generation
, what is filial two? - Answer-offspring of a cross between F1 individuals
what is a true-breeding lineage? - Answer-organisms that produce offspring of the same
variety over many generations of self-pollination?
what is Mendel's first law? - Answer-the two members of a gene pair segregate from
each other into the gametes and each gamete carries one member of the gene pair
when does mendelian segregation occur? - Answer-anaphase 1 of meiosis
True or false: an individual displaying a dominant trait may be only homozygous -
Answer-false. may be homozygous or heterozygous
True or false: an individual displaying a recessive trait may only by homozygous -
Answer-true. recessive alleles only show when there is no other trait
what does dominant mean? - Answer-fully expressed in phenotype
what does co-dominant mean? - Answer-heterozygous individuals express traits of both
alleles
what does incomplete dominance mean? - Answer-heterozygous individuals have both
the dominant and recessive traits; 3 phenotypes
what is pleiotropy? - Answer-multiple phenotypic effects due to a single allele
what is an example of pleiotropy? - Answer-sickle cell; maintenance of the sickle cell
what is the difference between heterozygous and homozygous sickle alleles? - Answer-
heterozygous: exertional sickling, low oxygen environments
homozygous: sickle cell anemia, 10% of red blood cells destroyed
what is dihybrid? - Answer-2 different genes that are linked
dihybrid crosses - Answer-independent assortment or linkage
independent assortment of dihybrid - Answer-four different phenotypes, color and shape
alleles are on different chromosomes
linkage of dihybrid - Answer-2 linked genes physically located on the same
chromosome, the alleles linked on the chromosome will be transmitted to the same
gamete, different expectation for the phenotype of the offspring
when are test crosses performed? - Answer-when the genotype is unknown
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