Biology 1407 Blinn Exam 1 Questions With Complete
Solutions
A field contains two related species of flowering plants. Species
A has a diploid chromosome number of 10, and species B has a
diploid chromosome number of 16. If a third species arises as a
result of hybridization between A and B, how many
chromosomes will it have? Correct Answers 26
A fossil of a marine crab, suspected to be 500 million years old,
is discovered in South America. Which of the following is the
most accurate way of determining the age of the fossil? Correct
Answers Radiometric dating of igneous rocks near the fossil
using 40K
A hypothetical ancestral population (AABB) splits into two
independent lineages. Mutations produce different new alleles
fixed at each loci in each population (AAbb in one population,
aaBb in the other). According to the Dobzhansky-Muller model,
which genotype would not be viable if the F1 individuals were
inviable? Correct Answers aabb
a neutral allele Correct Answers can accumulate in populations
A population of beavers has 135 individuals that are
homozygous for one allele, 230 that are heterozygous, and 135
that are homozygous for the other allele. Compared with Hardy-
Weinberg expectations, this population has _______ too _____
heterozygotes Correct Answers 20, few
, Allele frequencies can be used to measure the _______ of a
Mendelian population, whereas _______ show(s) how it is/they
are distributed among the population's members. Correct
Answers genetic variation; genotype frequencies
alleles are Correct Answers Different forms of a gene
An evolutionary biologist makes decisions about whether to
consider three different populations of copepods as separate
species based on observations of the individuals with which
these copepods will mate. All combinations of these populations
are able to mate with one another, but none of the combinations
produce viable offspring. This biologist is most likely
employing the _______ species concept, and based on the
application of this species concept to these results, there are
most likely _______ species of copepods present. Correct
Answers biological; three
Assuming there are only two alleles at a given locus, if the
frequency of one allele is 0.3, what is the frequency of the other
allele? Correct Answers 0.7
Autopolyploidy Correct Answers occurs when a single plant
duplicates its chromosome
Coal is the fossilized remains of _______ from the
Carboniferous period. Correct Answers tree ferns and horse
tails
Consider four species of conifers. Species A and B are sister
species. Species C and D are also sister species. The clade
Solutions
A field contains two related species of flowering plants. Species
A has a diploid chromosome number of 10, and species B has a
diploid chromosome number of 16. If a third species arises as a
result of hybridization between A and B, how many
chromosomes will it have? Correct Answers 26
A fossil of a marine crab, suspected to be 500 million years old,
is discovered in South America. Which of the following is the
most accurate way of determining the age of the fossil? Correct
Answers Radiometric dating of igneous rocks near the fossil
using 40K
A hypothetical ancestral population (AABB) splits into two
independent lineages. Mutations produce different new alleles
fixed at each loci in each population (AAbb in one population,
aaBb in the other). According to the Dobzhansky-Muller model,
which genotype would not be viable if the F1 individuals were
inviable? Correct Answers aabb
a neutral allele Correct Answers can accumulate in populations
A population of beavers has 135 individuals that are
homozygous for one allele, 230 that are heterozygous, and 135
that are homozygous for the other allele. Compared with Hardy-
Weinberg expectations, this population has _______ too _____
heterozygotes Correct Answers 20, few
, Allele frequencies can be used to measure the _______ of a
Mendelian population, whereas _______ show(s) how it is/they
are distributed among the population's members. Correct
Answers genetic variation; genotype frequencies
alleles are Correct Answers Different forms of a gene
An evolutionary biologist makes decisions about whether to
consider three different populations of copepods as separate
species based on observations of the individuals with which
these copepods will mate. All combinations of these populations
are able to mate with one another, but none of the combinations
produce viable offspring. This biologist is most likely
employing the _______ species concept, and based on the
application of this species concept to these results, there are
most likely _______ species of copepods present. Correct
Answers biological; three
Assuming there are only two alleles at a given locus, if the
frequency of one allele is 0.3, what is the frequency of the other
allele? Correct Answers 0.7
Autopolyploidy Correct Answers occurs when a single plant
duplicates its chromosome
Coal is the fossilized remains of _______ from the
Carboniferous period. Correct Answers tree ferns and horse
tails
Consider four species of conifers. Species A and B are sister
species. Species C and D are also sister species. The clade
