Homework Answers
Assuming that, the gene causing white spot y is dominant over the gene producing no spot is Y.
So, the genotype of white spot producing hamster is Yy and the genotype of no spot producing hamster is YY.
In first case, when white spot producing hamster crosses with no spot producing hamster the progenies are:
Yy X YY
|
Y |
y |
|
|
Y |
YY |
Yy |
|
Y |
YY |
Yy |
So, we can see here that ½ of the offspring have white spot and ½ of the offspring have no spot.
In second case, when white spot producing hamster crosses with white spot producing hamster the progenies are:
Yy X Yy
|
Y |
y |
|
|
Y |
YY |
Yy |
|
y |
Yy |
yy |
So, we can see here that 2/3 (Yy,yy) of the offspring have white spot and 1/3 of the offspring have no spot.
(a) From the above explanation, we can say that the white spot producing gene is recessive dominant gene.
(b) It is also possible to produce Chinese hamster that are true breeding (homozygous) for white spotting and we can also saw this in the above second cross.
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Multiple choice, Select one:
a. Red is incomplete dominance to yellow and the heterozygotes
have orange eyes.
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red but dominant to yellow. Yellow is recessive to both red and
orange.
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e. Red is...
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3. In silkworms the hemolymph (functionally equivalent to blood) may be yellow or white. Fully developed larvae may be plain or have numerous heavy markings, a condition called moricaud (Tanaka, Adv. Genet. 5: 240, 1953). A cross is made between the two true-breeding strains yellow, plain x white, moricaud. 10 Fį females are crossed with 10 Fı males, producing the following outcome: 293 yellow, moricaud 96 yellow, plain 104 white, moricaud 38 white, plain Provide a genetic explanation for these...
Answer the following questions for the dihybrid cross described. In a plant blue flowers crossed with white flowers results in blue and white spotted. Additionally, broad leaves are more common even when crossed with thin. (A) What is the mode of inheritance of flower color? Cross: A (1) true breeding blue flower plant with broad leaves is crossed with a (2) blue and white spotted flower with thin leaves. (B) What is the genotype of the two parents involved in...
Background Information for Question 1:
.
Question 1 A)
What is the inheritance pattern of eye colour? Explain your
answer.
Multiple choice, Select one:
a. Red is incomplete dominance to yellow and the heterozygotes
have orange eyes.
b. Red is dominant to orange and yellow. Orange is recessive to
red but dominant to yellow. Yellow is recessive to both red and
orange.
c. We need more information to answer the question.
d. Red is dominant to yellow.
e. Red is...
Background Information for Question 1:
.
Question 1 A)
What is the inheritance pattern of eye colour? Explain your
answer.
Multiple choice, Select one:
a. Red is incomplete dominance to yellow and the heterozygotes
have orange eyes.
b. Red is dominant to orange and yellow. Orange is recessive to
red but dominant to yellow. Yellow is recessive to both red and
orange.
c. We need more information to answer the question.
d. Red is dominant to yellow.
e. Red is...
Background Information for Question 1:
.
Question 1 A)
What is the inheritance pattern of eye colour? Explain your
answer.
Multiple choice, Select one:
a. Red is incomplete dominance to yellow and the heterozygotes
have orange eyes.
b. Red is dominant to orange and yellow. Orange is recessive to
red but dominant to yellow. Yellow is recessive to both red and
orange.
c. We need more information to answer the question.
d. Red is dominant to yellow.
e. Red is...
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