Transcript Concept Check Questions 15.1

Concept Check Questions
15.1
Which of Mendel’s laws relates to the
inheritance of alleles for a single
character? Which law relates to the
inheritance of alleles for two characters
in a dihybrid cross? What is the
physical basis of these laws?
Concept Check Questions
15.1
If the eye-color locus in Drosophila
were located on an autosome, what
would be the sex and phenotype of all
the F2 offspring produced by the
crosses in Figure 15.4 (orange book) or
Figure 15.3 (green book)?
Concept Check Questions
15.2
When two genes are located on the
same chromosome, what is the
physical basis for the production of
recombinant offspring in a test cross
between a dihybrid parent and a
double-mutant parent?
Concept Check Questions
15.2
For each type of offspring in Figure
15.5 (orange book) or Figure 15.4
(green book), explain the relationship
between its phenotype and the alleles
contributed by the female parent.
Concept Check Questions
15.2
Genes A, B, and C are located on the
same chromosome. Test crosses show
that the recombinant frequency
between A and B is 28% and between A
and C is 12%. Can you determine the
linear order of these genes?
Concept Check Questions
15.3
A white-eyed female Drosophila is
mated with a red-eyed (wild type) male,
the reciprocal cross of that shown in
Figure 15.4 (orange book) or Figure
15.3 (green book). What phenotypes
and genotypes do you predict for their
offspring?
Concept Check Questions
15.3
Neither Tim nor Rhoda has Duchenne
muscular dystrophy, but their firstborn
son does have it. What is the
probability that a second child of this
couple will have the disease?
Concept Check Questions
15.4
More common than completely
polyploid animals are mosaic
polyploids, animals that are diploid
except for patches of polyploid cells.
How might a mosaic tetraploid—an
animal with some cells containing four
sets of chromosomes—arise?
Concept Check Questions
15.4
About 5% of individuals with Down
syndrome have a chromosomal
translocation in which one copy of
chromosome 21 is attached to
chromosome 14. How could this
translocation in a parent’s gonad lead
to Down syndrome in a child?
Concept Check Questions
15.4
Explain how a male cat could have the
tortoise shell phenotype.
Concept Check Questions
15.5
Gene dosage, the number of active
copies of a gene, is important to proper
development. Identify and describe two
processes that help establish the
proper dosage of certain genes.
Concept Check Questions
15.5
Reciprocal crosses between two primrose
varieties, A and B, produce the following
results:
A female x B male → offspring with all green
(nonvariegated) leaves.
B female x A male → offspring with spotted
(variegated) leaves.
Explain these results.
Concept Check Questions
15.5
Mitochondrial genes are critical to
the energy metabolism of cells, but
mitochondrial disorders caused by
mutations in these genes are
usually not lethal. Why not?
Concept Check Questions
16.1
How did bacterial transformation
occur in Griffith’s famous
experiment?
Concept Check Questions
16.1
In Hershey and Chase’s experiment
with the virus T2, what result would
you expect if protein were the
genetic material?
Concept Check Questions
16.1
A fly has the following percentages
of nucleotides in its DNA: 27.3% A,
27.6% T, 22.5% G, 22.5% C. How
do these numbers demonstrate
Chargaff’s rules?
Concept Check Questions
16.1
How did Watson and Crick’s model
demonstrate Chargaff’s rules?
Concept Check Questions
16.2
What role does complementary
base pairing play in the replication
of DNA?
Concept Check Questions
16.2
Identify two major functions of DNA
pol III in DNA replication.
Concept Check Questions
16.2
Why is DNA pol I necessary to
complete synthesis of a leading
strand? Point out in the overview
box in Figure 16.16 (orange book
and green book) where DNA pol I
would fuction on the top leading
strand.
Concept Check Questions
Concept Check Questions
16.2
How are telomeres important for
preserving eukaryotic genes?