Which statement about a dihybrid cross is true? - ANSWERSIt is a cross between identical double heterozygotes
When a dihybrid black, normal winged fly is crossed with a double recessive gray, vestigial winged fly, the frequency with which black, vestigial winged and gray, normal winged flies are...
Which statement about a dihybrid cross is true? - ANSWERSIt is a cross between
identical double heterozygotes
When a dihybrid black, normal winged fly is crossed with a double recessive gray,
vestigial winged fly, the frequency with which black, vestigial winged and gray, normal
winged flies are seen in the progeny is called ______ frequency. -
ANSWERSRecombination
Epistasis refers to - ANSWERSthe expression of one gene masking the expression of
another
The major drawback of asexual reproduction is that it - ANSWERSProduces less
variation among offspring compared to sexual reproduction
Bacteria typically have _______ where is eukaryotes have _______ - ANSWERSOne
chromosome that is usually circular; several chromosomes that are linear
Cytokinesis occurs during - ANSWERSM phase
Condensation of chromosomes occurs during - ANSWERSProphase
Cells that do not divide are usually arrested in - ANSWERSG1 phase
Late in mitotic anaphase a cell with 28 daughter chromosomes has _______
centromeres in the dividing cell - ANSWERS28
At the milestone that defines telophase, the chromosomes - ANSWERSare at opposite
poles
Which event is not part of sexual reproduction - ANSWERSThe fusion of sister
chromatids during fertilization
In an organism with a haploid number of nine, skin cell has ______ chromosomes, a
sperm cell at meiotic anaphase II has _____ chromosomes, and a newly formed zygote
has _____ chromosomes. - ANSWERS18;9;9
During meiosis the sister chromatids separate during - ANSWERSAnaphase II
,Bacteria engage in genetic transfers after a thin projection called a _____ extends from
one cell to another - ANSWERSSex pilus
A deoxyribosenucleoside is a - ANSWERSDeoxyribose plus a nitrogenous base
Which molecular model best describes the structure of the DNA molecule -
ANSWERSHelical, double-stranded, and anti-parallel
What accounts for the uniform diameter of the DNA molecule - ANSWERSA purine
always bonds with a pyrimidine
In DNA replication each newly made strand is - ANSWERSComplementary in sequence
to the strand from which it was copied
Mutations are - ANSWERSChanges in the nucleotide sequence of DNA that is passed
on from one organism to another
Which statement concerning somatic mutations or germline mutation is true -
ANSWERSGermline mutation's are passed on to gametes
Which molecule functions to transfer information from one generation to the next in
eukaryotes - ANSWERSDNA
Early transformation experiment demonstrated that adding DNA from bacterium strain B
to bacterium strain A could - ANSWERSProduce bacterium strain B
Purines include - ANSWERSadenine and guanine
A number of characteristics of the common garden pea made it suitable for Mendels
breeding experiments. Which of the following is not one of those characteristics -
ANSWERSIt can reproduce asexually
Mandel's crossing of rounded pea plants with wrinkled seeded pea plants resulted in
progeny that have all round seeds. This indicates that the wrinkled seed trait is -
ANSWERSRecessive
Some organisms can reproduce by cloning themselves, an asexual process. Which type
of organism is least able to naturally reproduce through cloning - ANSWERSMammals
And a growing DNA strand each monomer is added to which carbon of the deoxyribose
- ANSWERS3'
The molecules that function to replicate DNA in the cell are - ANSWERSDNA
polymerases
, The primer used for DNA replication - ANSWERSis needed only once on a leading
strand
The polymerase chain reaction - ANSWERSamplifies specific DNA sequences
The first repair of mistakes during DNA replication is made by - ANSWERSDNA
polymerase
The products of mitosis are - ANSWERStwo genetically identical nuclei
Despite the law of independent when two loci are on the same chromosome the
phenotypes of the progeny sometimes do not fit the predicted phenotypes this outcome
can be explained by the phenomenon of - ANSWERSLinkage
The structure of DNA explains which three major properties of genes - ANSWERSThey
contain information, replicate exactly, and can change to produce a mutation
If a double-stranded DNA molecule contains 60% T, it must contain _____ percent G -
ANSWERS40
Fission yeast can reproduce asexually following mitosis by - ANSWERSCytokinesis
The members of a homologous pair of chromosomes in a sexually reproducing
organisms - ANSWERSAre identical in size and appearance
How does a nucleus in G2 differ from a nucleus in G1 - ANSWERSThe G2 nucleus has
twice the amount of DNA has the G1 nucleus
Centrosomes - ANSWERSDetermine the plane of cell division
The mitotic spindle is composed of - ANSWERSmicrotubules
After the centromere's separate during mitosis the chromatids now called ______ move
toward opposite poles of the spindle - ANSWERSDaughter chromosomes
In mitotic metaphase, a cell with eight sister chromatids has ____ centromeres -
ANSWERSFour
The processes of synapsis and the formation of chiasmata does not - ANSWERSOccur
for all of the sister chromatids
Down syndrome can be diagnosed by means of an examination of the individuals -
ANSWERSKaryotype
A triploid Nucleus cannot undergo meiosis because - ANSWERSNot all of the
chromosomes can form homologous pairs
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