Dogs from the same litter are able to breed and produce living puppies. However, the close genetic relationship sometimes leads to health or physical issues in the offspring.
Breeding siblings is a form of "inbreeding," which refers to the mating of closely related dogs. When dogs within the same family are bred, the amount of genetic information is limited. Therefore, puppies are more likely to inherit genes that cause problems such as tumors, heart disease, bone disorders, immune system diseases and epilepsy. Puppies that come from unrelated parents have more genetic variation, so problematic genes are less likely to "double up" and produce defects.Learn More
Amphibians reproduce by laying eggs, but the fertilization process differs based on the type of amphibian. Amphibians include frogs and salamanders and they spend their lives living both on land and in the water.Full Answer >
Asian markets demand rhino horns for medicinal use, hangover cures and gifts. Rhino horns command high prices, which is why the poaching trade has flourished. Misinformation is another reason why hunters poach rhinos, as Internet rumors circulate about the possibility of rhino horns curing cancer.Full Answer >
Platyhelminthes, also known as flatworms, are hermaphrodites, meaning individuals of the species produce both sperm and eggs. These are released from the platyhelminthes where they become cross-fertilized by other platyhelminthes. Two types of platyhelminthes, trematoda and cestoda, lay eggs constantly. The turbellarian class has a seasonal cycle. Turbellaria also reproduce asexually by dividing. Turbellaria are the only class able to regenerate body parts.Full Answer >
Polar bears reproduce via internal fertilization, with one male mating with several females during the mating season, staying with each for their three-day period of fertility. Mating occurs between late winter and early spring, after which gestation lasts anywhere between 195 and 265 days due to the females' ability to delay fetal development. Litter sizes range from one to four cubs but average two cubs per litter.Full Answer >