Plant reproduction

Environmental Control of Sex Determination in Ceratoteris richardii Gametophytes Christine Robson April 14th, 2016 Lab Section 2010: Thursday; 9:30am Professor Gibbons James Madison University Introduction: Sex determination in organisms can be controlled by either the inheritance of sex chromosomes or environmental conditions. In many organisms, the sex of a developing embryo is determined by the inheritance of sex chromosomes that contain genetic information which…

We have observed the morphological traits from male and female of two Bruchinae species, which are Senegalia tenuifolia seed-predators, and how these traits are influenced by the resource traits variation under different conditions such as sampling events and sites. In respect to our hypothesis in which the increase in resource quantity increases body size and biomass, we have confirmed it partially. In general, female insects tend to have a larger body size than the males, and the difference…

Male traits signal health and vigor, which are used to choose a mate, this may differ among populations. The female chooses a mate with the ability to provide resources for breeding, like food and parental care; which is important to the female and those that have genetic qualities like immunity which is passed to the offspring. Sometimes the mate choice is based upon the male’s secondary sexual trait. Some females prefer male-male competition to select a mate. Some select according to size or…

Kuhelj and Virant-Doberlet conducted their study, “Male-Male interactions and male mating success in the leafhopper Aphrodes makarovi” in order to be able to determine how male-male interaction is correlated to their reproductive success. The researchers had first hypothesized that a female leafhopper is more likely to mate with male who exhibits a higher effort in their calls. The males with the longer or louder call would be more likely to get a longer response from the female, which in the…

The Strawberry Poison-Dart Frog (Dendrobates pumilio, as well as, Oophaga pumilio) are very small, slender, dioecious, bilateral symmetric ("Poison frogs", 2003; Sandmeier, 2001; Savage, 2002; Penner 2011, n.p.) creatures that normally reach 17-24 mm in length with four, digits on their hands and feet. These frogs have dark eyes and their skin is very dewy with a gleamy appearance (Penner 2011, n.p.) and tend to vary in colors –strawberry-red, yellow, white, green, orange all mostly with black…

The most used common name is veiled chameleon. As this chameleon species is located in Yemen it is also called the Yemen chameleon, it’s also called the cone-head chameleon because of the shape of its head crest. (Red List) There is controversy over another subspecies of C. Calyptratus called C. c. calcarifer that looks similar in all but coloration however it has been found to be a hybrid with another chameleon Chamaeleo arabicus. (Necas) Physical Description Photo credit: Necas,…

Plants and animals have made changes in their habitats as they have transitioned from water environments to land environments. This alteration requires the organisms to adapt to their new environments in order to survive and reproduce. These evolutionary transitions eventually led up to alterations in means of respiration, ways to prevent water loss, water dependent reproduction, and structural transformations. Amphibians evolved into reptiles and eventually into birds and mammals, being able to…

more closely related to the rat. They are simi-aquatic animals and use water to escape from predators. They can stay submerged for up to 5 minutes and can press their ears to their heads in order to keep water out. They eat grasses and aquatic plants and have special digestive adaptations that allow them to retain nutrients from their highly fibrous diet. They also eat their own feces which allows them to ingest a higher percentage of proteins and other nutrients. Capybaras live in small…

Often times while watching television or listening to the radio, a company will advertisement a product. Whether the product be an engaging toy, an effective cleaning chemical, or a new wonder drug, at the very end of the advertisement there is most always a disclaimer. “This toy is not safe for children under three years old” and “do not use this product if you are pregnant or breastfeeding” are among the more popular sayings. The reason for the latter disclaimer is likely due to the advertised…

What many people realize and don’t understand is that being born with an Intersex condition is not easy as everyone thinks or sounds. People paint a picture of what an intersex person looks like and what their genitals looks like in their mind. Even people in the LGBT community often times paints a rosy picture of what life is like for an Intersex person. The reality is, that it’s not easy being an intersex person and it sure ain’t easy having to deal with your Intersex condition. Many people…