By Farabee M.
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Additional resources for ANIMAL CELLS AND TISSUES
They have strong limbs and are fast runners. They also have scaly eyelids, conspicuous ear openings, pointed heads, elongate bodies and tails, and bodies usually patterned by stripes, checks, crossbars, or spots. Most species are bisexual, but about 15 unisexual biotypes—some diploid and some triploid—are known within the family. , 2002). The genus Aspidoscelis (formerly Cnemidophorus, in part) includes about ten recognized taxa that are either parthenogenetic or include parthenogenetic lineages (Wright and Vitt, 1993), an example of which is detailed below.
Sporadic Natural Parthenogens All of the unisexual biotypes described above perpetuate clonal lineages by obligatory or constitutive parthenogenesis. , 2003) occurs sporadically in a few sexual vertebrates. Zookeepers have long suspected that some bisexual species are capable of tychoparthenogenesis, based on an observation that females maintained in long-term isolation occasionally produce viable offspring. Molecular genetic assays have conﬁrmed that some such progeny do carry their mother’s DNA only, and thus indeed had a single parent.
All forms of clonal reproduction begin with the faithful replication of genetic material. 3. The clonal propagation of genetic material (nucleic acids) normally relies on the informational redundancy inherent in the double-stranded structure of duplex DNA. During mitosis, nuclear genomes are clonally copied during the proliferation of an individual’s somatic cells, all of which trace back to a single cell (a fertilized egg or zygote in sexual species). A multicellular individual can hence be viewed as a tight-knit colony of clonemate cells.