Post-lab question 4 Indicate the possible genotypes of the gametes. RR Rr rr Pos
ID: 259951 • Letter: P
Question
Post-lab question 4
Indicate the possible genotypes of the gametes.
RR
Rr
rr
Post-lab question 5
What are the diploid genotypes resulting from gamete fusion?
r
r
R
r
R
R
Post-lab question 6
Answer the following for the stated problem:
Homozygous/Heterozygous?
Round/Wrinkled?
RR
Rr
rr
Post-lab question 7
Answer the following for the stated problem:
What percentage of the offspring is homozygous dominant?
What percentage of the offspring is heterozygous?
What percentage of the offspring is homozygous recessive?
What percentage of the offspring is tall? Why?
What percentage of the offspring is short? Why?
Exercise 8
Answer the following for the stated problem:
B. What are the chances that they will produce a color-blind son?
C. What are the chances that they will produce a color-blind daughter?
D. Is there any way these parents might produce a daughter with normal vision? If so, how?
E. Is there any chance these parents might produce a son with normal vision? If so, how?
Exercise 14
Note: “normal” means that the individual does not phenotypically show the trait (hint- we don’t know the genotype of this person! There are two potential genotypes that could produce a “normal” phenotype). A “carrier” is someone who is phenytopically normal but who carries a gene for the trait (hint: we do know the genotype for a person like this… what is it?). Being “affected” with cystic fibrosis means that the individual has the disease, and is not just a carrier (hint- we do know the genotype for a person like this… what is it?).
A. What percentage of the gametes of a heterozygote individual will contain the recessive allele?
B. What percentage of the offspring will be affected with cystic fibrosis? (see above for definition of “affected”)
C. What percentage of the offspring will be normal? (see above for definition of “normal”)
D. What percentage of the offspring will carry the trait? (see above for definition of a “carrier”)
E. Is it possible for an affected child to be born to non-carrier and carrier parents? Why?
RR
Rr
rr
Explanation / Answer
Ans 4 :
The genotypes of the gametes depend on the genotypes of the cells of the organism.
The homozygous produces only single kind of gamete, whereas a heterozygote can produce two types of gametes.
So here :
RR : R
Rr : R and r
rr : r
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