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Dihyrbrid Crosses

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Last updated almost 2 years ago
32 questions
Note from the author:
dihybridc crosses
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Question 1
1.

What is the genotype for blue body color and homozygous recessive oval eyes?

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Question 20
20.

Draw the cross between a snail that is heterozygous for white shell and a snail with a black shell.

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Question 22
22.

Draw the cross between two snails that are heterozygous for pink skin.

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Question 2
2.

What is the genotype for round eyes and homozygous recessive stubby nose?

Question 3
3.

What is the genotype for purple body and heterozygous for long nose?

Question 4
4.

Blue body color (B) is dominant to purple body color (b). Round eyes (R) is dominant to oval eyes (r). How many offspring in the cross will be blue with round eyes (B_R_).

Question 5
5.

Blue body color (B) is dominant to purple body color (b). Round eyes (R) is dominant to oval eyes (r). How many offspring in the cross will be blue with oval eyes (Bbrr or BBrr)?

Question 6
6.

Blue body color (B) is dominant to purple body color (b). Round eyes (R) is dominant to oval eyes (r). How many offspring in the cross will be purple with round eyes (bbRR or bbRr)?

Question 7
7.

Blue body color (B) is dominant to purple body color (b). Round eyes (R) is dominant to oval eyes (r). How many offspring in the cross will be purple with oval eyes (bbrr)?

Question 8
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Question 9
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Question 10
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Question 11
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Question 12
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Question 13
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Question 14
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Question 15
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Question 16
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Question 17
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Question 18
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Question 19
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Question 21
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Question 23
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Question 24
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Question 25
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Question 26
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Question 27
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Question 28
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Question 29
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Question 30
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Question 31
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Question 32
32.

What is the phenotypic rato?
4:4:4:4
9:3:3:1
8:8
Long nose (L) is dominant to stubby nose (l). Blue eyes (B) are dominant to purple eyes (b). What is the phenotype of BbLl?
blue eyes long nose
blue eyes stubby nose
purple eyes long nose
purple eyes stubby nose
Long nose (L) is dominant to stubby nose (l). Blue eyes (B) are dominant to purple eyes (b). What is the phenotype of bbLl?
blue eyes long nose
blue eyes stubby nose
purple eyes long nose
purple eyes stubby nose
Long nose (L) is dominant to stubby nose (l). Blue eyes (B) are dominant to purple eyes (b). What is the phenotype of Bbll?
blue eyes long nose
blue eyes stubby nose
purple eyes long nose
purple eyes stubby nose
Long nose (L) is dominant to stubby nose (l). Blue eyes (B) are dominant to purple eyes (b). What is the phenotype of bbll?
blue eyes long nose
blue eyes stubby nose
purple eyes long nose
purple eyes stubby nose
Long nose (L) is dominant to stubby nose (l). Blue eyes (B) are dominant to purple eyes (b). What is the probability that the baby will have blue eyes with a stubby nose?
9/16
3/16
4/16
1/16
Long nose (L) is dominant to stubby nose (l). Blue eyes (B) are dominant to purple eyes (b). What is the probability that the baby will be purple eyes with a stubby nose?
9/16
3/16
4/16
1/16
Long nose (L) is dominant to stubby nose (l). Blue eyes (B) are dominant to purple eyes (b). What is the probability that the baby will be blue eyes with a long nose?
9/16
3/16
4/16
1/16
Long nose (L) is dominant to stubby nose (l). Blue eyes (B) are dominant to purple eyes (b). What is the probability that the baby will be blue eyes with a stubby nose?
9/16
3/16
4/16
1/16
Long nose (L) is dominant to stubby nose (l). Blue eyes (B) are dominant to purple eyes (b). What is the probability that the baby will have purple eyes?
8/16
10/16
4/16
3/16
Use the chart below to identify the phenotype of a snail with the genotype WwPpbb
white shell white skin big eyes
black shell white skin small eyes
white shell pink skin small eyes
black shell pink skin small eyes
Use the chart to determine the genotype of a snail that is recessive for shell color, heterozygous for skin color, and homozygous dominant for eyes.
WWPPBB
wwPpBB
WwPpBb
wwPpbb
Look at #20 What percent of the offspring will have a white shell?
100%
75%
50%
25%
Look at #22, What is the phenotypic ratio.
2:2
4:0
3:1
What is the phenotype of a fruit that is RrFf?
red and round
red and pear shaped
yellow and round
yellow and pear shaped
Considering only fruit color, how many of the offspring will be red?
16/16
12/16
9/16
3/16
Considering only shape color, how many of the offspring will be round?
16/16
12/16
9/16
3/16
How many of the offspring will be yellow and round?
16/16
12/16
9/16
3/16
1/16
How many of the offspring will be yellow and pear shaped?
16/16
12/16
9/16
3/16
1/16
L= long stem, l= short stem
Y= yellow seed, y= green seed

Look at the dihybrid cross what is the phenotype of LlYy?
short stem and green seeds
long stem and green seeds
short stem and yellow seeds
long stem and yellow seeds
L= long stem, l= short stem
Y= yellow seed, y= green seed

Look at the dihybrid cross what is the phenotype of LlYY?
short stem and green seeds
long stem and green seeds
short stem and yellow seeds
long stem and yellow seeds
L= long stem, l= short stem
Y= yellow seed, y= green seed

How many of the offspring will be short stemed with yellow seeds?
16/16
9/16
3/16
1/16
0/16
L= long stem, l= short stem
Y= yellow seed, y= green seed

How many of the offspring will be long stemed with yellow seeds (L_Y_)?
16/16
9/16
3/16
1/16
0/16