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1. What type of inheritance pattern is seen in sex-linked disorders?
A
Codominant
B
X-linked
C
Autosomal recessive
2. In autosomal recessive disorders, an affected individual must inherit the allele from...
A
Both parents
B
Neither parent
C
One parent
3. What is the term for an individual who carries a recessive allele but does not express the trait?
A
Homozygous dominant
B
Carrier
C
Heterozygous recessive
4. In codominance, what happens to the alleles of a gene?
A
Both are expressed equally
B
One is dominant over the other
C
Neither is expressed
5. Which type of disorder requires only one copy of the mutant allele to be expressed?
A
X-linked recessive
B
Codominant
C
Autosomal dominant
6. What is the probability of a carrier mother and a carrier father having an affected son in X-linked recessive inheritance?
A
25%
B
75%
C
50%
7. In autosomal dominant disorders, an affected individual has...
A
Two unaffected parents
B
At least one affected parent
C
Only unaffected siblings
8. What is the term for the phenomenon where both alleles are fully expressed in a heterozygote?
A
Codominance
B
Recessive inheritance
C
Incomplete dominance
9. Which type of inheritance pattern is seen in cystic fibrosis?
A
X-linked dominant
B
Autosomal recessive
C
Codominant
10. What is the chance of two carrier parents having an affected child in autosomal recessive inheritance?
A
25%
B
50%
C
75%
11. Queen Victoria had one allele for hemophilia. Why did hemophilia occur more frequently in her male descendants?
A
Because only one copy of the X chromosome is found in cells of males
B
Because only two copies of the X chromosome are found in males
C
Because only males are carriers
12. Lethal alleles are deadly, usually because they impact something important to growth and development.
A
True
B
False
C
13. Even though your body changes and you develop new physical and behavioral characteristics, your _______ never changes.
A
Genotype
B
Phenotype
C
Appearance
14. What is the genotype of the parents if 50% of the offspring have an O blood type and the other 50% have an B blood type?
A
BO and OO
B
BB and OO
C
AB and OO
15. What is a Punnett Square good for?
A
Predicting what the offspring will look like
B
Looking at the size and shape of chromosomes in a cell.
C
Predicting mutations in RNA
16. Is it possible for a visible trait to skip a generation?
A
Yes
B
No
C
17. If a BB parent is crossed with a bb parent, what would the phenotype ratio of offspring be?
A
1 (all the same)
B
1:1
C
2:1
18. Which genotype(s) is (or are) homozygous?
A
BB and ww
B
Bb and ww
C
Ww
19. With codominance, both alleles are fully expressed (but not mixed). The result includes both phenotypes.
A
True
B
False
C
20. With complete dominance, recessive traits are always fully expressed.
A
False
B
True
C
21. What pedigree charts are good for?
A
To analyze the pattern of inheritance of a particular trait throughout a family
B
To make students go crazy
C
To predict the size of a mutation
22. The DNA in the skin cells of your hand is significantly different in sequence from the DNA in your liver cells.
A
False
B
True
C
23. Different genotypes can produce the same phenotype.
A
True
B
False
C
24. What is an autosomal trait?
A
A trait that is located on an autosome
B
A trait that is located on a sex chromosome
C
Having two identical alleles for a particular gene
25. The terms dominant and recessive refer to the way that a trait is expressed, not by how often it shows up in a family.
A
True
B
False
C
26. Which organelles have their own DNA?
A
Mitochondria and chloroplasts
B
None of them
C
Ribosomes
27. Which one of the following is a genotype of a male?
A
XY
B
XX
C
XXX
28. Where do males get the X chromosome from?
A
Their mother
B
Their father
C
Both
29. X-linked recessive inheritance refers to:
A
The gene causing the disorder is located on the X chromosome.
B
The gene causing the disorder is located on the Y chromosome.
C
The gene causing the disorder is located on the autosomes.
30. A characteristic of X-linked inheritance is that fathers cannot pass X-linked traits to their sons
A
True
B
False
C