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Genetics Test
1. What type of problem is represented in the punnett square?
Incomplete Dominance
R
R
R
RR
RR
W RW RW
Questions 2-4. Refer to the Monohybrid Cross below to answer the following questions.
Geno
BB
Bb
bb
B
b
B
BB
Bb
b
Bb
3 bb
Pheno
Black
brown
2. Both parents in the above cross are:
Black
3. The Genotype of both parents in the above cross is…
Bb
4. The phenotype of the offspring indicated by box “3” would be:
Black
5. The genotypic ratio of the F1 generation would be:
1:2:1
6. The phenotypic ratio of the F1 generation would be:
3:1
7. How many traits are crossed in a dihybrid Cross?
Two
8. Which of the following would be a phenotype?
Blue eyes
9. What is the study of heredity called?
Genetics
10. Round (R) seeds are dominant to wrinkled. A heterozygous seed is crossed with a
wrinkled seed. What are the genotypes of the parents?
A. RR x rr
B. Rr x rr
C. Rr x Rr
D. rr x rr
11. What are the genotypes of the F1 generation?
A. RR, rr
B. Rr
C. Rr, rr
D. rr
12. Free hanging (F) ears are dominant to attached ear lobes, and dimples (D) are
dominant to not having dimples. Cross two people that are heterozygous for both
traits.
FF
FFDD
Ff
FfDD
Ff
FfDD
ffDD
FFDd
FfDd
FfDd
ffDd
FFDd
FfDd
FfDd
ffDd
FFdd
Ffdd
Ffdd
ffdd
F
F
f
ff
f
FF
Ff
Ff
ff
D
d
D
DD
Dd
d
Dd
dd
13. What are the genotypes of the P generation?
FfDd x FfDd
14. What is the phenotypic ratio? (I changed this question to be more like the test)
9:4:3 (yellow to blue to grey)
15. What is the order of the genotypic ratio?
Dom-Dom, Dom-Rec, Rec-Dom, Rec-Rec
16-23. The below pedigree represents the inheritance of an autosomal recessive
gene that causes albinism. Figure out the genotypes of person A, B, C, E, F, and G
and match them with the genotype answer choices below.
16.
17.
18.
19.
20.
21.
22.
23.
Genotype of person A
Genotype of person B
Genotype of person C
Genotype of person E
Genotype of person F
Genotype of person G
Is person D male?
Is person E albino?
24. A female that looks normal, yet has both a defective X chromosome and a normal X
chromosome is a …
carrier female
25. An inheritance pattern that produces the equal expression of genes, such as a
checkered chicken is called…
codominance
26. An inheritance pattern that produces a blend of the two homozygous parents’
phenotypes is called…
incomplete dominance
27. The 23rd pair of chromosomes are also called…
sex chromosomes
Use the following information to answer questions 28-30.
SS
SS’
S’S’
28. What type of dominance is represented in
the key and punnett square on the right?
incomplete dominance
29. What is the genotypic ratio?
0:2:2
30. How many of the offspring have curly hair?
2
S
S’
S’
SS’
S’S’
S’
SS’
S’S’
Use the following information to answer questions 31-36.
31. What are the phenotypes of the P1 generation?
Carrier female & normal male
32. What percent of the F1 generation are normal females?
25%
S’ X*
X
S’
Y
X
33. What are the phenotypes of the F1 generation?
Normal male, defective male, normal female, carrier female
34. What percentage of the F1 generation are defective (phenotype)?
25%
35. What is the genotypic ratio?
KEY
straight hair
wavy hair
curly hair
X*X
X*Y
X
XX
XY
1:1:0:1:1
36. What is the phenotypic ratio? (add the normal looking females together for this one)
2:0:1:1
Two couples, the Pages and the Bakers, had baby boys in the same hospital at the same
time. There may have been a mix-up in the hospital nursery. The Pages took home baby # 1
and the Bakers took home baby # 2. Use the information given in the table below to
answer the questions below with “A” for YES and “B” for NO.
37. Was there a mix-up at the hospital?
No
38. Based on the Baker’s blood types could baby # 1 be their child?
Yes, if baby #1 is IA i
39. Based on the Pages’ blood types, could either or both babies be theirs?
Mr. Page cannot be baby #2 father because he does not have an “i” in his genes to give.
Name
Blood
Genotype
Mrs. Page
IB IB
OR
IB i
Mr. Page
IA IB
Mrs. Baker
IB IB
Mr. Baker
IA IA
Baby # 1
IA IA
IB i
IA i
IA i
OR
40. Does baby # 2 have O type blood? Yes
OR
OR
Baby # 2
ii