Bio Quiz On Sexual Selection | Custom Online Assignments

  1. Male bower birds (birds that look like crows and live in Australia and Papua New Guinea) make elaborate structures (called bowers) out of grass and twigs. Males decorate their bowers with objects they find, like feathers of other birds, pieces of glass, shells, and bits of plastic: items that have no direct benefit to females. Females find some bower decorations VERY sexy and will mate with a male based on his bower decorations.

A. Propose a hypotheses for why this behavior in males and females evolved.

In pipefish (fish related to seahorses) instead of the female carrying the growing offspring, the male holds them in a brood pouch in his body until they hatch out. Basically, male pipefish are pregnant and their bodies supply the growing embryos with some nutrients required for development.

Don't use plagiarized sources. Get Your Custom Essay on
Bio Quiz On Sexual Selection | Custom Online Assignments
Just from $13/Page
Order Essay
  • Large females that mate with males create more costly broods for males. In other words, it takes more energy for males to sustain their pregnancy with these offspring, mostly because many embryos inherited large size from their mother. Generally, the offspring of large mothers survive better than the offspring of small mothers.
  • Males can’t sustain multiple pregnancies in a short period of time from large females without substantial risks to their own health and survival.
  • After mating with a small female, male pipefish can “increase the rates of offspring abortion in pregnancies…to retain resources for future reproductive opportunities” (Paczolt & Jones, Nature, 2010).

A. Is the phenomenon of male-induced abortions Intersexual Selection or Intrasexual selection?

B. How would you describe it using the Sexual Selection categories that we discussed in class? (Hint: it is possible that we didn’t discuss this phenomenon from the male’s point of view.)

C. Briefly describe why you think such a phenomenon would evolve: specifically, why would males abort a brood of offspring mothered by a small female?

  1. In black goby fish, males build nesting sites (a “cave” made out of rocks and shells) in which the females lay their eggs. Males fertilize these eggs then care for them until hatching. Males attract females to their nesting sites by releasing pheromones (chemicals that influence the behavior of other goby fish) into the water. These pheromones also provoke aggression in other males.
  • In addition to “parental males”- those that create nesting sites and care for young, there are smaller males that do not make nesting sites but swim into the nests of other males (usually undetected) while a female is there laying eggs. These smaller males then release sperm in order to fertilize that female’s eggs.
  • Parental males have a large gland that produces lots of their “sexy” pheromone, while the smaller non-parental males have only a tiny pheromone gland.
  • In experiments, parental males exposed to the glandular extracts of other males (which would contain the pheromone) reacted with aggressive behaviors like tail-beating and biting toward the source of the pheromone. When parental males were exposed to the glandular extracts of small, non-parental males, they had no reaction (Locatello et al., Journal of Experimental Biology, 2010).

A. Is the phenomenon of non-parental males in this mating system an example of Intersexual Selection (between two different sexes) or Intrasexual selection (within the same sex)?

B. How would you describe it using the Sexual Selection categories that we discussed in class?

C. Briefly describe why you think such non-parental males would evolve to have no sexual pheromones.

Homework Writings Pro
Calculate your paper price
Pages (550 words)
Approximate price: -

Why should I choose Homework Writings Pro as my essay writing service?

We Follow Instructions and Give Quality Papers

We are strict in following paper instructions. You are welcome to provide directions to your writer, who will follow it as a law in customizing your paper. Quality is guaranteed! Every paper is carefully checked before delivery. Our writers are professionals and always deliver the highest quality work.

Professional and Experienced Academic Writers

We have a team of professional writers with experience in academic and business writing. Many are native speakers and able to perform any task for which you need help.

Reasonable Prices and Free Unlimited Revisions

Typical student budget? No problem. Affordable rates, generous discounts - the more you order, the more you save. We reward loyalty and welcome new customers. Furthermore, if you think we missed something, please send your order for a free review. You can do this yourself by logging into your personal account or by contacting our support..

Essay Delivered On Time and 100% Money-Back-Guarantee

Your essay will arrive on time, or even before your deadline – even if you request your paper within hours. You won’t be kept waiting, so relax and work on other tasks.We also guatantee a refund in case you decide to cancel your order.

100% Original Essay and Confidentiality

Anti-plagiarism policy. The authenticity of each essay is carefully checked, resulting in truly unique works. Our collaboration is a secret kept safe with us. We only need your email address to send you a unique username and password. We never share personal customer information.

24/7 Customer Support

We recognize that people around the world use our services in different time zones, so we have a support team that is happy to help you use our service. Our writing service has a 24/7 support policy. Contact us and discover all the details that may interest you!

Try it now!

Calculate the price of your order

Total price:
$0.00

How it works?

Follow these simple steps to get your paper done

Place your order

Fill in the order form and provide all details of your assignment.

Proceed with the payment

Choose the payment system that suits you most.

Receive the final file

Once your paper is ready, we will email it to you.

Our Services

Our reputation for excellence in providing professional tailor-made essay writing services to students of different academic levels is the best proof of our reliability and quality of service we offer.

Essays

Essay Writing Service

When using our academic writing services, you can get help with different types of work including college essays, research articles, writing, essay writing, various academic reports, book reports and so on. Whatever your task, homeworkwritingspro.com has experienced specialists qualified enough to handle it professionally.

Admissions

Admission Essays & Business Writing Help

An admission essay is an essay or other written statement by a candidate, often a potential student enrolling in a college, university, or graduate school. You can be rest assurred that through our service we will write the best admission essay for you.

Reviews

Editing Support

Our professional editor will check your grammar to make sure it is free from errors. You can rest assured that we will do our best to provide you with a piece of dignified academic writing. Homeworkwritingpro experts can manage any assignment in any academic field.

Reviews

Revision Support

If you think your paper could be improved, you can request a review. In this case, your paper will be checked by the writer or assigned to an editor. You can use this option as many times as you see fit. This is free because we want you to be completely satisfied with the service offered.