|
Gregor Mendel's work was different
from that of other researchers working
on inheritance in his day because he
alone: |
|
actually counted the numbers and
types of offspring |
| |
|
If several traits are affected by the
same allele, the allele is said to be: |
|
pleiotropic |
| |
|
Foxes, cats, and rabbits have enzymes that are heat-sensitive, causing a seasonal variation in coat color due to: |
|
an environmental effect |
| |
|
The diploid number of chromosomes in pea plants is 14. What is the haploid chromosome number? |
|
7 |
| |
|
Human height shows a continuous variation from the very short to the very tall. Height is most likely controlled by: |
|
multiple genes |
| |
White flower color is
recessive to purple. What is the genotypic ratio when two heterozygous pea
plants are crossed? |
|
1:2:1 |
| |
Red-green colorblindness is a sex-linked trait. A woman with
normal color vision, whose father was colorblind, mates with a colorblind man. What chance do each of their sons have of being colorblind?
|
|
50% chance |
| |
What is the probability of getting a pea plant with recessive green seed color when two heterozygous pea plants, both having the dominant yellow-seeded phenotype, are crossed with each
other?
|
|
1 in 4 |
| |
Humans who have lost one
copy of a chromosome are called ____________ and generally do not survive
development |
|
monosomics |
| |
Nondisjunction of
chromosomes resulting in aneuploidy occurs during: |
|
anaphase I or II |
| |
Mendel tested for
heterozygotes by using: |
|
testcross |
| |
The degree of earlobe attachment in humans is inherited as a simple dominant of free earlobes, or as a recessive allele of attached earlobes. What is the probability that a woman
with attached earlobes will have children with attached earlobes if their father has free earlobes, but his father had attached earlobes? |
|
1 in 2 |
| |
Genes for sex-linked traits
tend to be carried on what chromosomes? |
|
X chromosomes |
| |
Hemophilia is a group of
different inherited blood-clotting disorders. Which is true about hemophilia? |
|
It is more common in males
than in females |
| |
A central role for
chromosomes in heredity was first suggested by: |
|
Karl Correns |
| |
Two true-breeding pea
plants are crossed, one with purple flowers and the other with white. Their
offspring are: |
|
heterozygous with the
dominant phenotype |
| |
Down syndrome in humans is
due to: |
|
trisomy (three copies of
chromosome #21) |
| |
In the human ABO blood
grouping, there are four basic blood types, type A, type B, type AB, and type
O. The blood proteins A and B are: |
|
codominant |
| |
Which of the following is a
sex-linked disorder? |
|
Duchenne muscular dystrophy |
| |
Which procedure is the
least-invasive method of assessing fetal health while development is still
occurring? |
|
Ultrasound |
| |
The ability to taste PTC is
a dominant trait. If a heterozygote woman has a child with a man who is not a taster,
what is the chance their child will be a taster? |
|
50% |
| |
Whose work with fruit flies
presented the first clear evidence that the genes determining Mendelian traits
reside on chromosomes? |
|
Thomas Hunt Morgan |
| |
What is the product of
transcription? |
|
RNA |
| |
In snapdragons,
pink-flowered plants are produced when red-flowered plants are crossed with
white-flowered plants. This type of inheritance can best be described as: |
|
incomplete dominance |
| |
The outward expression of
an organism's genotype is referred to as its genotype.
|
|
FALSE |
| |
