BIOL 1020; SOLO EXAM 3 QUESTIONS
AND ANSWERS 100% CORRECT | NEW
UPDATE 2025
Substitution of one base pair for another in a coding region of a gene can result in
a ___________ mutation that changes a codon that once coded for an amino acid
to code for a stop codon - ANSWER Nonsense
A woman with blood type O has a child with blood type O. What are all of the
possible blood types of the father? - ANSWER A, B, or O
In a small mustard plant species, gene mapping crosses are performed between
the gene controlling whether flower petals are produced and the gene controlling
whether pollen is produced. Making no petals is recessive, as is making no pollen.
For the cross the parents plants fertilized make no petals and no pollen, and the
plants that are the source of the pollen have been bred to be heterozygous for
both genes (as is usual for such a mapping cross). The offspring phenotypes were
recorded as follows:
14 with petals but without pollen
8 without petals but with pollen
40 with petals and with pollen
38 without petals and without pollen
What is the map distance between the genes for these two traits? - ANSWER
22 map units
, In humans, wet earwax is a dominant trait governed by normal Mendelian
inheritance for a single autosomal gene with two possible alleles; the other trait,
dry earwax, is recessive. A man with dry earwax has one child, and that child has
wet earwax. What is the genotype of the man with respect to the wet/ dry earwax
gene? - ANSWER Homozygous recessive
Fossils are typically dated by: - ANSWER Association with index fossils, relative
position in rock layers, and radioisotope dating of rock layers above and below
A woman with normal color vision and a man who is red-green colorblind produce
a daughter who is red-green colorblind. Knowing that red-green colorblindness is
controlled by a gene on the X-chromosome, you can predict that the odds of being
red-green colorblind for any more children they have would be - ANSWER 50%
for sons, 50% for daughters
In humans, wet earwax is a dominant trait governed by normal Mendelian
inheritance for a single autosomal gene with two possible alleles; the other trait,
dry earwax, is recessive. A woman with dry earwax and a man with wet earwax
have a son, and he has dry earwax. What is the genotype of the man with respect
to the wet/ dry earwax gene? - ANSWER Heterozygous
What represents the order of increasingly higher levels of organization of
chromatin? - ANSWER Nucleosome, 30 nm chromatin fiber, looped domain
What nucleotide sequence represents the complementary sequence that would
bind to the DNA strand
5' - CTGACG - 3' - ANSWER 3' - GACTGC - 5'
AND ANSWERS 100% CORRECT | NEW
UPDATE 2025
Substitution of one base pair for another in a coding region of a gene can result in
a ___________ mutation that changes a codon that once coded for an amino acid
to code for a stop codon - ANSWER Nonsense
A woman with blood type O has a child with blood type O. What are all of the
possible blood types of the father? - ANSWER A, B, or O
In a small mustard plant species, gene mapping crosses are performed between
the gene controlling whether flower petals are produced and the gene controlling
whether pollen is produced. Making no petals is recessive, as is making no pollen.
For the cross the parents plants fertilized make no petals and no pollen, and the
plants that are the source of the pollen have been bred to be heterozygous for
both genes (as is usual for such a mapping cross). The offspring phenotypes were
recorded as follows:
14 with petals but without pollen
8 without petals but with pollen
40 with petals and with pollen
38 without petals and without pollen
What is the map distance between the genes for these two traits? - ANSWER
22 map units
, In humans, wet earwax is a dominant trait governed by normal Mendelian
inheritance for a single autosomal gene with two possible alleles; the other trait,
dry earwax, is recessive. A man with dry earwax has one child, and that child has
wet earwax. What is the genotype of the man with respect to the wet/ dry earwax
gene? - ANSWER Homozygous recessive
Fossils are typically dated by: - ANSWER Association with index fossils, relative
position in rock layers, and radioisotope dating of rock layers above and below
A woman with normal color vision and a man who is red-green colorblind produce
a daughter who is red-green colorblind. Knowing that red-green colorblindness is
controlled by a gene on the X-chromosome, you can predict that the odds of being
red-green colorblind for any more children they have would be - ANSWER 50%
for sons, 50% for daughters
In humans, wet earwax is a dominant trait governed by normal Mendelian
inheritance for a single autosomal gene with two possible alleles; the other trait,
dry earwax, is recessive. A woman with dry earwax and a man with wet earwax
have a son, and he has dry earwax. What is the genotype of the man with respect
to the wet/ dry earwax gene? - ANSWER Heterozygous
What represents the order of increasingly higher levels of organization of
chromatin? - ANSWER Nucleosome, 30 nm chromatin fiber, looped domain
What nucleotide sequence represents the complementary sequence that would
bind to the DNA strand
5' - CTGACG - 3' - ANSWER 3' - GACTGC - 5'
