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  2. Polycephaly - Wikipedia

    en.wikipedia.org/wiki/Polycephaly

    Polycephaly. Polycephaly is the condition of having more than one head. The term is derived from the Greek stems poly (Greek: "πολύ") meaning "many" and kephalē (Greek: "κεφαλή") meaning "head". A polycephalic organism may be thought of as one being with a supernumerary body part, or as two or more beings with a shared body.

  3. Compound heterozygosity - Wikipedia

    en.wikipedia.org/wiki/Compound_heterozygosity

    Compound heterozygosity. In medical genetics, compound heterozygosity is the condition of having two or more heterogeneous recessive alleles at a particular locus that can cause genetic disease in a heterozygous state; that is, an organism is a compound heterozygote when it has two recessive alleles for the same gene, but with those two alleles ...

  4. Diprosopus - Wikipedia

    en.wikipedia.org/wiki/Diprosopus

    The other infant was born with duplication of the upper and lower jaw, two tongues arising from the same base, cleft palate, a slightly divided tip of the nose, and two widely spaced eyes, as well as absence of the corpus callosum, duplication of the pituitary gland and stalk, and abnormalities in the midbrain. Because they were born with a ...

  5. Craniopagus parasiticus - Wikipedia

    en.wikipedia.org/wiki/Craniopagus_parasiticus

    Craniopagus parasiticus is an extremely rare type of parasitic twinning occurring in about 4 to 6 of 10,000,000 births. [1] In craniopagus parasiticus, a parasitic twin head with an undeveloped body is attached to the head of a developed twin. Fewer than a dozen cases of this type of conjoined twin have been documented in literature.

  6. Hox gene - Wikipedia

    en.wikipedia.org/wiki/Hox_gene

    Hox gene. Hox genes, a subset of homeobox genes, are a group of related genes that specify regions of the body plan of an embryo along the head-tail axis of animals. Hox proteins encode and specify the characteristics of 'position', ensuring that the correct structures form in the correct places of the body.

  7. Amphisbaena - Wikipedia

    en.wikipedia.org/wiki/Amphisbaena

    One of the animals shown is a two-headed snake (conjoined twin snakes), with one head on each end, much like an amphisbaena. The image is captioned, " two headed snakes of India are harmless ". [ 8 ] It is possible a sighting of an animal like this was the origin of the amphisbaena.

  8. Polymorphism (biology) - Wikipedia

    en.wikipedia.org/wiki/Polymorphism_(biology)

    t. e. In biology, polymorphism[1] is the occurrence of two or more clearly different morphs or forms, also referred to as alternative phenotypes, in the population of a species. To be classified as such, morphs must occupy the same habitat at the same time and belong to a panmictic population (one with random mating). [2]

  9. Sexual dimorphism - Wikipedia

    en.wikipedia.org/wiki/Sexual_dimorphism

    The sexual dimorphism in amphibians and reptiles may be reflected in any of the following: anatomy; relative length of tail; relative size of head; overall size as in many species of vipers and lizards; coloration as in many amphibians, snakes, and lizards, as well as in some turtles; an ornament as in many newts and lizards; the presence of ...