An example of homozygous recessive phenotype would be a red-flowered pea plant. The white-flowered pea plant expresses the dominant phenotype.
Organisms carry both dominant and recessive alleles of a gene. Such organisms would be called carriers of a recessive allele. In this instance, the organism would only show the dominant phenotype of the gene. Cystic fibrosis is another homozygous recessive phenotype. Other diseases, such as Huntington's, are also expressed through the recessive phenotype. However, individuals with Huntington's have either a mutant-mutant expression or a normal-mutant one.
Homozygous means that the organism contains two copies of the same allele for a particular gene. Homozygous recessive means that the organism carries two recessive alleles. Such as with the example above, the white-flowered pea plant has two white alleles to make it be expressed that way. Carriers of the recessive gene are considered to be heterozygous, meaning they have only one allele of each of the dominant and recessive alleles. Huntington's disease is considered to be autosomal dominant, so an individual with this disease could either have a heterozygous gene or a homozygous dominant one. The genotype is the combination of alleles for a certain gene. The genotypes provide the framework for the phenotype that will be expressed.Learn More
Cryptosporidium, Toxoplasma gondii, Pneumocystis carinii, Acanthamoeba, Giardia lamblia and Naegleria are all examples of protozoa. They are unicellular eukaryotic organisms that exist in all habitable environments on Earth, and many species of protozoa act as parasites on higher animals.Full Answer >
Some examples of Monera are halobacteria, methanobacteria, pyrococcus and methanosarcinales, which are considered members of the domain archaea. Other monerans are all known bacteria. Members of monera are single-celled prokaryotes, which means that their cells have no nuclei or organelles protected by membranes.Full Answer >
Some examples of biotechnology include human gene therapy, genetically modifying plants and changing the genes of bacteria. Biotechnology helps improve crops so they produce more, healthier produce. It also helps fight human diseases.Full Answer >
The apple scar skin, cleus blemei and coconut cadang-cadang viroids are examples of these subviral agents. Identified in 1971 by plant pathologist Theodor Otto Diener, viroids represent the smallest and simplest infectious pathogens known as of 2015.Full Answer >