CMB 352 Genetics Exam 1 With
Solution
In lima beans, green color is dominant over yellow color. A cross between a
pure green bean and a pure yellow bean yields 40 hybrid beans. A cross
between two of these hybrid beans yielded 160 F2 beans. How many F2
beans should be yellow? - ANSWER 40
Mendel's unit factors of heredity are most accurately known to be: - ANSWER
two alleles for a gene on a maternal an petal homologue of a homologous
pair
If shape and color of gourds are determined by 2 genes with co-dominant
alleles, crossing a dihybrid heterozygote with a homozygous recessive will
produce ___ different phenotypes. - ANSWER 4
A couple has four children whose blood types are A, A, B and AB. Which of
the following parental genotypes are capable of producing the blood types
of the couples' children? - ANSWER I^AI^O and I^BI^O
Following a SsYy x SsYy cross, what fraction of the offspring are predicted to
have a genotype that is heterozygous for both characteristics? - ANSWER
, 4/16
If X unites of of DNA are present in the nucleus of a cell, which has just
divided, what is the relative amount present in this cell during prophase of
the next mitosis? - ANSWER 2X
A geocentric chromosome has its centromere located very close to, but not
on, the end of the chromosome. - ANSWER false
A diploid cell of grasshopper: - ANSWER has nice the amount of genetic
information as the haploid cell of a grasshopper
The number of genetically distinct gametes that an individual can produce is
predicted: - ANSWER using the formula 2^N, where N equals the umber of
heterozygous gene pairs
Pleiotrophy is: - ANSWER when more than one phenotype results from the
action of a single gene
What is the difference between incomplete dominance and co-dominance? -
ANSWER In co-dominance, both phenotypes are equally expressed in
hybrids; in complete dominance, the hybrid shows a new phenotype that is
intermediate between the two homozygotes
Solution
In lima beans, green color is dominant over yellow color. A cross between a
pure green bean and a pure yellow bean yields 40 hybrid beans. A cross
between two of these hybrid beans yielded 160 F2 beans. How many F2
beans should be yellow? - ANSWER 40
Mendel's unit factors of heredity are most accurately known to be: - ANSWER
two alleles for a gene on a maternal an petal homologue of a homologous
pair
If shape and color of gourds are determined by 2 genes with co-dominant
alleles, crossing a dihybrid heterozygote with a homozygous recessive will
produce ___ different phenotypes. - ANSWER 4
A couple has four children whose blood types are A, A, B and AB. Which of
the following parental genotypes are capable of producing the blood types
of the couples' children? - ANSWER I^AI^O and I^BI^O
Following a SsYy x SsYy cross, what fraction of the offspring are predicted to
have a genotype that is heterozygous for both characteristics? - ANSWER
, 4/16
If X unites of of DNA are present in the nucleus of a cell, which has just
divided, what is the relative amount present in this cell during prophase of
the next mitosis? - ANSWER 2X
A geocentric chromosome has its centromere located very close to, but not
on, the end of the chromosome. - ANSWER false
A diploid cell of grasshopper: - ANSWER has nice the amount of genetic
information as the haploid cell of a grasshopper
The number of genetically distinct gametes that an individual can produce is
predicted: - ANSWER using the formula 2^N, where N equals the umber of
heterozygous gene pairs
Pleiotrophy is: - ANSWER when more than one phenotype results from the
action of a single gene
What is the difference between incomplete dominance and co-dominance? -
ANSWER In co-dominance, both phenotypes are equally expressed in
hybrids; in complete dominance, the hybrid shows a new phenotype that is
intermediate between the two homozygotes
