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1 Black fur in mice (B) is dominant to brown fur (b). Short tails (T) are dominant to long tails (t). What fraction
of the progeny of crosses between BbTt x BBtt are expected to have black fur and long tails? Please show
your work. (Punnett square needs to show just the necessary info no need for a 16-square box here) (1 pt)
a. 1/16
b. 3/16
c. 3/8
d. ½
e. 9/16
Answer is d.
BT
Bt
bT
bt
Bt
BBTt
BBtt
BbTt
Bbtt
Bt
BBTt
BBtt
BbTt
Bbtt
Bt
BBTt
BBtt
BbTt
Bbtt
Bt
BBTt
BBtt
BbTt
Bbtt
2 Amniocentesis reveals that an embryo has hemophilia (X-linked recessive). What is this disease? What are
the genotypes of the parents if they do not have this disease? What is the likely sex of the embryo? Why?
What is the probability that their other children will express this trait? (show Punnet square to help your
explanation) (2 points)
Ans. Hemophilia is a clotting disorder resulting in an inhibility of blood to clot properly. Father can be XY,
mother can be X’X. Likely sex of embryo is male. As hemophilia is a X linked recessive disorder, she has
same probability to bear another child with hemophilia
X
X’
X’X
Y
XY
3 A woman who has the blood type O has children that have the blood types A and B with her partner, who has
an unknown blood type. From what you know, what is the genotype of the father? Please show your work.
Although multiple alleles for this cell-surface antigen occur in the general public, how many does each person
carry? Why? (2 pts)
Ans. Genotype of the father is AB, as shown in the figure. Each person carries three alleles for that, as blood
group is determined by three alleles.
Fugure :-
A
O
AO
O
A0
4 How is it possible for two people who have medium brown hair to have a child that has dark brown hair?
What type of inheritance is this? Please explain. (2 pts)
Ans.
5 A genetic analysis of students in this class indicates that they are carrying two traits related to the class. The
dominant trait "classophiliase" when carried in the dominant form (C) enables people to absolutely adore the
class. Another dominant trait "examase" when carried in the dominant form (E) allows people to ace the
exams without doing much work. A man who is homozygous dominant for both traits produces children with

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a woman who is homozygous recessive for both. Please show parental genotypes and gametes produced by
these parents, the F1 generation produced from these gametes, and then the resulting gametes and offspring
from mating between F1 individuals that results in the F2 generation. List phenotypes (and their ratios), also
show what genotype produces each phenotype. Show Punnett Squares for this dihybrid cross. (2 points)
Ans.
CE
CE
CE
CE
ce
CcEe
CcEe
CcEe
CcEe
ce
CcEe
CcEe
CcEe
CcEe
ce
CcEe
CcEe
CcEe
CcEe
ce
CcEe
CcEe
CcEe
CcEe
F1 generation Genotype = Cc Ee Phenotype = Classophillase & Examiphillase
CE
Ce
cE
ee
CE
CCEE
CCEe
CcEE
CcEe
Ce
CCEe
CCee
CcEe
Ccee
cE
CcEE
CcEe
CCEE
ccEe
ce
CcEe
Ccee
ccEe
ccee
Phenotypic Ratios for Classophilic Examophilic : Classophilic Examophobic : Classophobic : Examophilc :
Classophobic : Examophobic are 9:3:3:1
Classophilic Examophilic are CCEE
Classophilic Examophobic are CC ee and Cc ee
Classophobic : Examophilc are cc EE and cc Ee
Classophobic : Examophobic are ccee
6 Here are data from a research team’s work on menstrual product absorbance. Please use Excel to enter the
data (you can copy and paste the table), calculate the average and standard deviation, and make a graph
showing those data (with correct X and Y axes titles, please, along with a chart title). What can you conclude
from this? What role do the SD bars play in your conclusion? (3 pts) Please post your Excel file to the
Dropbox made for this purpose.
Table 1. Raw data collected by Team BioSpectacular. Three tampon types were assessed for the amount of
fluid they could absorb (ml) in a 5 minute period. Ten replicate tampons were tested for each brand.
Up and Up Generic Super
NaturCare Organic Super
Walgreens Generic Super
15
21
17
12
22
19
11
20
19
18
19
20
17
21
17
15
22
18
11
20
20
16
21
17
14
19
19
12
21
18

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1 Black fur in mice (B) is dominant to brown fur (b). Short tails (T) are dominant to long tails (t). What fraction of the progeny of crosses between BbTt x BBtt are expected to have black fur and long tails? Please show your work. (Punnett square needs to show just the necessary info – no need for a 16-square box here) (1 pt) a. 1/16 b. 3/16 c. 3/8 d. ½ e. 9/16 Answer is d. Bt Bt Bt Bt 2 BT BBTt BBTt BBTt BBTt Bt BBtt BBtt BBtt BBtt bT BbTt BbTt BbTt BbTt bt Bbtt Bbtt Bbtt Bbtt Amniocentesis reveals that an embryo has hemophilia (X-linked recessive). What is this disease? What are the genotypes of the parents if they do not have this disease? What is the likely sex of the embryo? Why? What is the probability that their other children will express this trait? (show Punnet square to help your explanation) (2 points) Ans. Hemophilia is a clotting disorder resulting in an inhibili ...
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