Other
Biol 113 Lecture 14-19 Practice Material
- Course
- BIO113
- Institution
- State University Of New York - Binghamton
Practice Material for Lectures 14-19. *Essential Study Material!!
[Show more]
Content preview
Practice set 8:Covers lectures 14-19
Complete each set of questions as we advance through the course material.
Every question in this exam is connected!
PsbS gene is a gene in plants which codes for a protein called “pigment binding protein S” that is
essential for proper photosystem II functioning. When PsbS is mutated, plants have a much slower rate of
growth than is typical. They are “poor growing”.
PSBS denotes the normal allele for this gene. psbs denotes the mutated, recessive allele for this gene.
Pineapples have 25 chromosomes. PsbS is located on chromosome 22. Also on chromosome 22 and
located right next to PsbS, is the gene for spikes, where R represents the allele for sharp spikes and r
represents the allele for blunt spikes. Chromosome 21 contains the skin gene, where F represents the
allele for tough skin and f represents the allele for soft skin.
Questions 1-6 covers lectures 14-15
1. The wild ancestors of pineapples had two copies of each of their 25 chromosomes. Commercially
grown pineapples of present day have three copies of each of their 25 chromosomes. What is the
correct scientific notation for commercial pineapple chromosome number?
a) 25, 75
b) 75, 25
c) 25,3
d) 3,25
2. Kiara Jackson PhD is a plant geneticist working for a major university in southern California. She
has been tasked with assessing a local farmer’s pineapple crops to find out why 20% of them
displayed poor growth this season. Kiara takes samples of the well-growing pineapples and the
poor-growing pineapples. Kiara extracts an egg from one well-growing pineapple plant and
performs genetic analysis. The egg’s genotype is PSBS/R/f. How did the plant’s chromosomes
line up at the metaphase plate? (Assume the well-growing plant genotype is PSBSpsbs, Rr, Ff. In
other words, it is heterozygote for all genes.)
, 3. Which two alleles will most likely be inherited in a different combination than in their parent’s
chromosomes (recombination)?
a) PSBS/psbs and R/r
b) PSBS/psbs and F/f
4. Remember that the extracted egg’s genotype is PSBS/R/f. Kiara fertilizes this egg from a random
sampling of pollen (sperm) from a male pineapple plant with the genotype PSBS/psbs R/r f/f. In a
punnet square of this cross, how many gametic combination of the female’s must be represented?
How many gametic combinations of the male must be represented?
a) Female: 1. Male: 4
b) Female: 2. Male: 2
c) Female: 4. Male 4:
5. Kiara takes a sample from a different well-growing plant. It also has sharp spikes and tough skin.
She doesn’t know its genotype. She mates this plant with one that is poor-growing, has blunt
spikes and soft skin. Half of the resulting offspring are well-growing with sharp spikes and tough
skin. The other half is poor-growing with sharp spikes and tough skin. What is the genotype of
the unknown parent plant?
a) PSBSpsbs, RR, FF
b) PSBSpsbs, Rr, Ff
c) psbspsbs, RR, ff
6. Like humans, pineapple “males” contain X and Y chromosomes in their diploid cells while
“females” will contain two X chromosomes in their diploid cells. There is a gene located on the X
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller anyiamgeorge19. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $10.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
67096 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now