NAME____________________________ DATE ________ PERIOD ________
FORMAT:
14 M/C
5 MATCHING
8 SHORT ANSWER
40 POINTS TOTAL
What to Study:
Chapter 7 Notes
Ch 7 SG
Genetics Part II Packet
This Review Sheet
CHAPTER 7 QUEST REVIEW SHEET
Question
1. A person who is heterozygous for a recessive
disorder is also known as a __?
2. Genes found on chromosomes that do not
determine gender
3. Genes found on chromosomes that do determine
gender
4. Genotype of a male
Answer
Carrier
Autosomal genes
Sex-linked genes
XY
5. Genotype of a female
XX
6. Phenomenon where one X chromosome is shut
down in a female
7. Type of inheritance where heterozygote phenotype
is a “blending” of the parents – neither allele is
completely dominant or completely recessive
8. Type of inheritance where two alleles are
expressed equally (Ex: Type AB blood)
9. Traits that are produced by two or more genes (ex:
hair color) resulting in a wide range of phenotypes.
10. A person with Type A blood could have what two
genotypes?
11. A person with Type O blood has what genotype?
X Chromosome inactivation
12. Who can be carriers of sex-linked traits?
Only females
13. If a son has a sex-linked disorder, who did he
inherit it from?
14. If a daughter has a sex-linked disorder, what do
you know about her father?
15. A chart that is used to trace phenotypes and
genotypes within multiple generations of a family
16. If a child has a disease, but neither parent has it,
how is the disease inherited? What do you know about
both parents?
17. If you see a pedigree where mostly males have a
particular trait, what do you know about that trait?
His mother
18. A picture of a person’s chromosomes
Karyotype
Incomplete dominance
Codominance
Polygenic traits
AA or AO
OO
He also has to have the
disorder
Pedigree
Autosomal recessive
Both parents have to be
carriers
The trait is sex-linked
19. A karyotype with 3 copies of chromosome #21
has this disorder
Down syndrome (Trisomy 21)
20. Examples of sex-linked disorders
Hemophilia
Color blindness (red-green)
21. In addition to genotype, phenotypes are
influenced by this
The environment
22. A human trait controlled by multiple alleles (more
than two)
23. On a pedigree, how are males represented?
Blood types (A, B, & O alleles)
Note: also displays
codominance
Squares
24. On a pedigree, how are females represented?
circles
25. If one parent is heterozygous for a Huntington’s disease (a dominant-allele
disorder), and the other parent does not have the disorder, what are the chances they
will have a child with the disorder? 50%
H
h
Hh (has
disorder)
h
Hh (has
disorder)
h
hh (normal)
hh (normal)
26. Incomplete Dominance Problem: Cross a Pink snap dragon with a white snap
dragon. What are the phenotypes of the offspring? 50% Pink & 50% white
R
r
rr (white)
Rr (pink)
r
Rr (pink)
r
rr (white)
27. Codominance Problem #1: Cross a Black Feathered chicken with a speckled
chicken. What are the phenotypes of the offspring? 50% Black, 50% speckled
B
B
BB (black)
BB (black)
BW
(speckled)
BW
(speckled)
B
W
28. Codominance Problem #2: A woman with Type A blood has a child with a man who
was type AB. The woman’s mother was type O. Show the cross between these two
individuals:
A
O
AA
AO
AB
BO
A
B
What is the chance for them to have a baby with type O blood? __zero__ Type A? 50%
29. Sex-Linked Problem: A man with normal blood clotting marries a woman who is a
carrier for hemophilia. Show the cross below:
Man’s genotype: _ XHY
Woman’s genotype: XHXh _____
XH
Xh
XHXH
XHXh
XHY
X hY
XH
Y
Phenotypic Ratios of Offspring: 25% Normal females, 25% Carrier females (also
normal), 25% Normal males; 25% hemophiliac males