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bio 1406 exam 3 Questions and Correct
Answers
What do retroviruses like HIV do? Ans: integrates its viral DNA
into the DNA of the host cell, which allows the retrovirus to
replicate
If a somatic cell of an organism contains 26 chromosomes, then a
gamete contains_________ chromosomes. Ans: 13
What are the functions of mitosis in humans? Ans: Repair of
wounds, growth, replacement of lost or damaged cells
Why is it difficult to observe individual chromosomes during
interphase? Ans: they have uncoiled to form long, thin strands
If a somatic cell contains 8 chromosomes, there are ____ different
variations ofchromosomes are possible in its gametes. Ans: 16
Deletion Ans: (1) A deficiency in a chromosome resulting from the
loss of a fragment through breakage. (2) A mutational loss of one
or more nucleotide pairs from a gene.
Inversion Ans: occurs when a segment breaks off and reattaches
within the same chromosome, but in reverse orientation
Translocation Ans: The process in which a segment of a
chromosome breaks off and attaches to another chromosome.
nonjisdunction Ans: the failure of one or more pairs of
homologous chromosomes or sister chromatids to separate
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normally during nuclear division, usually resulting in an abnormal
distribution of chromosomes in the daughter nuclei.
Which phase of mitosis is essentially the opposite of prophase in
terms of changes
within the nucleus? Ans: telophase
What phase of the cell cycle would you see that DNA has been
doubled? Ans: interphase (s phase)
What is binary fission and how is it different from mitosis? Ans:
binary fission is the asexual reproduction of prokaryotic cells and
mitosis occurs in eukaryotic cells binary fission is simpler faster
process than mitosis
Where in mitosis are microfilaments important Ans: cleavage
furrow
Why is trisomy 21 more common than other chromosomal
disorders? Ans: the least lethal the offspring is most likely to
survive
What determines whether an allele is dominant or recessive? Ans:
the trait linked to a parent's sex-genes
Where are variations of traits found? (Think about where alleles
are on chromosomes) Ans: locus
Which individuals are most commonly affected by sex-linked traits
and disorders? Ans: males because they only inherit 1 X
chromosome
© 2025 All rights reserved
bio 1406 exam 3 Questions and Correct
Answers
What do retroviruses like HIV do? Ans: integrates its viral DNA
into the DNA of the host cell, which allows the retrovirus to
replicate
If a somatic cell of an organism contains 26 chromosomes, then a
gamete contains_________ chromosomes. Ans: 13
What are the functions of mitosis in humans? Ans: Repair of
wounds, growth, replacement of lost or damaged cells
Why is it difficult to observe individual chromosomes during
interphase? Ans: they have uncoiled to form long, thin strands
If a somatic cell contains 8 chromosomes, there are ____ different
variations ofchromosomes are possible in its gametes. Ans: 16
Deletion Ans: (1) A deficiency in a chromosome resulting from the
loss of a fragment through breakage. (2) A mutational loss of one
or more nucleotide pairs from a gene.
Inversion Ans: occurs when a segment breaks off and reattaches
within the same chromosome, but in reverse orientation
Translocation Ans: The process in which a segment of a
chromosome breaks off and attaches to another chromosome.
nonjisdunction Ans: the failure of one or more pairs of
homologous chromosomes or sister chromatids to separate
© 2025 All rights reserved
, 2 | Page
normally during nuclear division, usually resulting in an abnormal
distribution of chromosomes in the daughter nuclei.
Which phase of mitosis is essentially the opposite of prophase in
terms of changes
within the nucleus? Ans: telophase
What phase of the cell cycle would you see that DNA has been
doubled? Ans: interphase (s phase)
What is binary fission and how is it different from mitosis? Ans:
binary fission is the asexual reproduction of prokaryotic cells and
mitosis occurs in eukaryotic cells binary fission is simpler faster
process than mitosis
Where in mitosis are microfilaments important Ans: cleavage
furrow
Why is trisomy 21 more common than other chromosomal
disorders? Ans: the least lethal the offspring is most likely to
survive
What determines whether an allele is dominant or recessive? Ans:
the trait linked to a parent's sex-genes
Where are variations of traits found? (Think about where alleles
are on chromosomes) Ans: locus
Which individuals are most commonly affected by sex-linked traits
and disorders? Ans: males because they only inherit 1 X
chromosome
© 2025 All rights reserved
