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Question: You have been contacted by the organizing committee for the
annual Texas Butterfly Festival and t…


You have been contacted by the organizing committee for the
annual Texas Butterfly Festival and they would like you to help
them with a genetics problem. The organizing committee explains to
you that they want to release 100,000 butterflies to kick off their
festival. They would like to breed butterflies to have wing colors
of bright green, bright blue and bright yellow and also they would
like the butterflies to have a long “tail” on their wings (like the
butterflies circled in the picture).

butter.jpg

In the recent years, several butterfly genomes have been sequenced
and the protein expression for genes that code for color and tail
length are starting to be understood.
butter.jpg
  butter.jpg

You examine several species of butterflies and find one that you
think will work. The species you pick has 2 pairs of chromosomes
(N=2, 2N=4). The first protein you are interested in is coded for
by a single gene, the B gene, located on chromosome 1.

It codes for wing color and shows incomplete dominance. Individuals
that have the allele combination “BB” have bright blue wings and
individuals that have the allele combination “bb” have bright
yellow wings.

The genotype for a long tail is more difficult for you to figure
out, but eventually you realize that there are two genes involved.
Both genes are located on chromosome 2. The T gene determines
whether a tail will be present or not. Only individuals with the
genotype “tt” will have any type of tail. Finally, the G gene
determines the length of the tail. The allele “G” is dominant to
the recessive “g” allele. “G” codes for a short tail while “g”
codes for a long tail.

Q1. Write out the alleles present in a green butterfly that has a
short tail and is heterozygous for the G gene. (Note: In case you
are artistically challenged, blue and yellow make green when mixed)
[3 pts]

Bb Gg tt
Your submission has been recorded. Tries 1/1 Previous Tries

The butterfly in Question 1 is preparing to produce eggs and is
going through meiosis.

Q2. Draw a stick model for chromosome 1 and 2 for the butterfly in
question 1 before DNA replication. Label the loci for the genes and
label the alleles. You can take a photo of it with your phone and
upload that image as your answer.

Submitted files:

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50587B5E-3CE7-4B4E-9029-9EC3CDC78559.jpeg

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0.541 Thu Oct 11 10:27:19 pm 2018 (EDT)
Your submission has been recorded. Tries 1/1 Previous Tries

For the your stick model, answer the following questions.

Q2b. Are the chromosomes in this cell replicated?
Yes
No

Incorrect. Tries 1/1 Previous Tries

Q2c. How many different “kinds” or “types” of chromosomes are
represented? Also called “unique” chromosomes(N).
1
2
3
4

Incorrect. Tries 1/1 Previous Tries

Q2d. What is the best answer for the total number of chromosomes
and the ploidy of the cell?
4, diploid
4, haploid
2, haploid
2, diploid
3, diploid

Tries 0/1

Q3. Draw chromosomes showing the homologous pairs for chromosomes 1
and 2 for the butterfly from question 1 during metaphase of Meiosis
I. Represent the two possible alignments of the chromosomes, due to
independent assortment in A) and B). [Ignore crossing over]
You can take a photo of it with your phone and upload that image as
your answer.

Clearly label all alleles for all 3 genes. Also, label the sister
chromatids and homologous chromosomes in at least 1 instance in
your drawings.

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Combined size of all files not to exceed: 10.0
MB.

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Tries 0/1

For the model you drew, answer the following questions.

Q3b. Are the chromosomes in this cell replicated?
Yes
No

Tries 0/1

Q3c. How many different “kinds” or “types” of chromosomes are
represented? Also called “unique” chromosomes(N).
1
2
3
4

Tries 0/1

Q3d. What is the best answer for the total number of chromosomes
and the ploidy of the cell?
2, diploid
2, haploid
4, haploid
4, diploid
3, diploid

Tries 0/1

Q3e. For the entire cell above in box A, how many double helix DNA
molecules(i.e. chromatids) would be present?
6
2
8
4

Tries 0/1

Q4a. Draw all the possible products of meiosis (ie gametes) for
this butterfly in alignment A) and alignment B) from question
3.
You can take a photo of it with your phone and upload that image as
your answer.

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submit:
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doc,docx,xls,xlsx,ppt,pptx,png,jpg,jpeg,gif,txt,pdf,htm,html

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MB.

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Tries 0/1

For one of the cells above in Box A, answer the following
questions.

Q4b. For the cell above, answer the following questions.

Q4b. Are the chromosomes in this cell replicated?
Yes
No

Tries 0/1

Q4c. How many different “kinds” or “types” of chromosomes are
represented? Also called “unique” chromosomes(N).
1
2
3
4

Tries 0/1

Q4d. What is the best answer for the total number of chromosomes
and the ploidy of the each gamete?
2, diploid
2, haploid
4, haploid
3, diploid
4, diploid

Tries 0/1

Imagine you perform a cross between a BbTtgg butterfly and a BbttGG
butterfly. Show your work to determine the answers to Q5a-c. You
can use any method to help you determine the correct ratios.

Q5a. Take a picture of your work.

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Q5b. Choose the correct ratio of offspring that would be predicted
to have the genotype BbTtGg
1:8
2:8
3:8
4:8
5:8

Tries 0/1

Q5c. Choose the correct ratio of offspring that would be predicted
to have the phenotype green wings and no tails.
1:8
2:8
3:8
4:8
5:8

Tries 0/1

During the course of your lab work in both you have worked with
over 1,500 butterflies from the same species.

Q6. If we compare all the male butterflies that you have been
working with, do they all have the same genes?
No, because there is individual variation in which genes are
present in each butterfly.
Yes, because they all have the same genotype and phenotype.
Yes, because they are all the same species.
No, because if they had all the same genes they would all look
identical.

Tries 0/1

Q7. If we compare all the male butterflies that you have been
working with, do they all have the same alleles?
No, because there is individual variation in the alleles which
explains the phenotypes.
Yes, because they all have the same genotype and phenotype.
No, because the alleles can change when the environmental
conditions.
Yes, because they are all the same species so they have the same
nucleotide sequences.

Tries 0/1

Were there any questions you found confusing because of wording?
Please explain. If there were no questions type NA.

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Show transcribed image text

Q3. Draw chromosomes showing the homologous pairs for chromosomes 1 and 2 for the butterfly from question 1 during metaphase of Meiosis I. Represent the two possible alignments of the chromosomes, due to independent assortment n A) and B). [Ignore crossing over] You can take a photo of it with your phone and upload that image as your answer Clearly label all alleles for all 3 genes. Also, label the sister chromatids and homologous chromosomes in at least 1 instance in your drawings. Submission type: Submit entries below as answer to receive credit Save entries below (not submitted for credit yet) Choose file(s) to submit: Allowed filetypes: doc,docx,xls,xlsx,ppt,pptx,png,jpg,jpeg,gif,txt,pdf,htm,html Combined size of all files not to exceed: 10.0 MB. Submit a file: (only one file per submission) Choosc File No file chosen OR: Submit Arswer Tries 0/1 For the model you drew, answer the following questions. Q3b. Are the chromosomes in this cell replicated? Yes No Submit Answer Tries 0/1 Q3c. How many different "kinds* or "types" of chromosomes are represented? Also called "unique" chromosomes(N) 01 Submit Anewor Tries 0/1 Q3d. What is the best answer for the total number of chromosomes and the ploidy of the cell? 2, diploid O 2, haploid 4, haploitd 4, diploid 3, diploid

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