Download BIOL 1406-61313 CHAPTER 14 AND 15 Dr

BIOL 1406-61313
CHAPTER 14 AND 15
Dr. Jordan
1. The most common phenotype in a natural population is referred to as the _____.
genotype
wild type
autosome
mutant phenotype
locus
2. Linked loci are loci that _____.
have the same alleles residing on them
govern traits that have nothing to do with one another
govern traits (such as hair texture and hair color) that are functionally related
are on the same chromosome
determine sex
3. In general, the frequency that crossing over occurs between two linked genes depends
on _____.
how far apart they are on the chromosome
the phase of meiosis in which the crossing over occurs
whether the genes are on the X or some other chromosome
whether the genes are dominant or recessive
the character the gene codes for
4. In humans, the __________ determines the sex of the offspring because __________.
male ... the male can contribute either an X or a Y chromosome
female ... only the female provides cytoplasm to the zygote
male ... the sperm can fertilize either a female egg or a male egg
female ... only the female has two functional sex chromosomes
chromosome contribution from both parents ... the offspring uses all the parents'
chromosomes
5. Human males are much more likely to have hemophilia (a failure of the blood to clot
properly) than human females. This is the case because _____.
hemophilia is a contagious disease to which males are more susceptible
the gene for hemophilia is carried on the Y chromosome
the gene for hemophilia is carried on an autosome
hemophilia is the wild type
the gene for hemophilia is sex-linked
6. Which of the following is correct with regard to aneuploidy?
It's another name for inversion.
It can be represented by 2n + 1.
All aneuploid individuals die before birth.
It can be represented by 4n.
It involves only the autosomes.
7. If a fragment of a chromosome breaks off and then reattaches to the original
chromosome at the same place but in the reverse direction, the resulting chromosomal
abnormality is called _____.
a deletion
an inversion
a translocation
a nondisjunction
polyploidy
8. A particular allele can have different effects if it is inherited from a male rather than a
female. This phenomenon is known as _____.
extranuclear inheritance
aneuploidy
sex linkage
Prader-Willi syndrome
genomic imprinting
9. Human mitochondria _____.
are inherited as an X-linked trait
are all inherited from the father
have linear DNA
do not contain DNA
are all inherited from the mother
10. A heritable feature is a ______ and may have two or more variants called ______.
trait ... characteristics
character ... traits
character ... factors
trait ... factors
characteristic ... alleles
11. A plant with the genotype AABbcc is _____.
homozygous at two loci
heterozygous at two loci
recessive at three loci
triploid
all of the above
12. GgTt pea plants can produce _____________ type(s) of gametes, but a ggtt plant can
produce _____________ type(s) of gametes.
one ... two
two... one
four ... two
four ... one
one ... one
13. Two organisms with genotype AaBbCcDdEE mate. These loci are all independent.
What fraction of the offspring will have the same genotype as the parents?
3/4
1/4
9/64
1/16
4/3
14. Huntington's disorder is due to an autosomal dominant allele. If a heterozygous male
marries a normal female, what percentage of the offspring will have Huntington's?
0%
25%
50%
75%
100%
15. An allele is _____.
a type of chromosome
the dominant form of a gene
a variety of pea plant used by Mendel
an alternative version of a gene
the recessive form of a gene
16. You cross a true-breeding red-flowered snapdragon with a true-breeding whiteflowered one. All of the F1 are pink. What does this say about the alleles for the parental
traits?
Red and white are co-dominant.
Red is dominant.
Both red and white are recessive.
Red and white show incomplete dominance.
Pink is dominant, while red and white are recessive.