+
Related Flashcards
Related Topics
Cards In This Set
| Front | Back |
|
Why did the improvement of
microscopy techniques in the late 1800s set the stage for the emergence of
modern genetics?
|
It allowed the study of
meiosis and mitosis, revealing parallels between behaviors of genes and
chromosomes
|
|
When Thomas Hunt Morgan crossed his red-eyed F1 generation flies to each other, the F2 generation included both red- and
white-eyed flies. Remarkably, all the white-eyed flies were male. What was the
explanation for this result?
|
A) The gene involved is on
the X chromosome
|
|
) Morgan and his colleagues
worked out a set of symbols to represent fly genotypes. Which of the following
are representative?
|
C) vg+vgse+se ×
vgvgsese
|
|
Sturtevant provided genetic evidence for the existence of
four pairs of chromosomes in Drosophila
in which of these ways?
|
B) Drosophila genes cluster into four distinct groups of linked
genes
|
|
A man with Klinefelter syndrome (47, XXY) is expected to
have any of the following EXCEPT
|
C) increased testosterone
|
|
A woman is found to have 47 chromosomes, including 3 X
chromosomes. Which of the following describes her expected phenotype?
|
D) Normal female
|
|
Males are more often
affected by sex-linked traits than females because
|
A) males are hemizygous for the X chromosome.
|
|
What is the chromosomal
system for determining sex in mammals?
|
D) X-Y
|
|
What is the chromosomal
system for sex determination in birds?
|
E) Z-W
|
|
What is the chromosomal
system of sex determination in most species of ants and bees?
|
A) Haploid-diploid
|
|
SRY is best described in
which of the following ways?
|
A) A gene region present on
the Y chromosome that triggers male development
|
|
In cats, black fur color is caused by an X-linked
allele; the other allele at this locus causes orange color. The heterozygote is
tortoiseshell. What kinds of offspring would you expect from the cross of a
black female and an orange male?
|
D) Tortoiseshell females;
black males
|
|
Red-green color blindness is a sex-linked recessive trait in
humans. Two people with normal color vision have a color-blind son. What are
the genotypes of the parents?
|
E) XCXc and XCY
|
|
Cinnabar eyes is a sex-linked recessive characteristic in
fruit flies. If a female having cinnabar eyes is crossed with a wild-type male,
what percentage of the F1 males will have cinnabar eyes?
|
E) 100%
|
|
Calico cats are female
because
|
A) a male inherits only one
of the two X-linked genes controlling hair color.
|
