Abnormalities of companion animals : analysis of heritability / C.W. Foley, J.F. Lasley, G.D. Osweiler.

  • Foley, C. W.
Date:
1979
Catalogue details

Licence: Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)

Credit: Abnormalities of companion animals : analysis of heritability / C.W. Foley, J.F. Lasley, G.D. Osweiler. Source: Wellcome Collection.

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    1 • FUNDAMENTAL PRINCIPLES OF GENETICS 11 -Sugar '¡_ I Phosporic acid i ijriGleculeJ A nucleotide G-guanine C-cytosine A-adenine T-thymine -Sugar Phosphoric acid molecule Fig. 1.6. Diagrammatic sketch of a DNA molecule. A, T, C, and G are bases, with A always joined to T and С to G. molecule also differs from the DNA molecule in that it contains the base, uracil (U), which replaces thymine (T) found in DNA. In RNA, uracil always unites with adenine and guanine with cytosine. Probably most RNA molecules are formed in the nucleus in a process similar to that which pro¬ duces new DNA molecules. The DNA molecule separates and one of the strands serves as a template or mold to form a single strand of RNA with (U to A) and (G to C) from cell constitutents. At least three RNA molecules are known. These are messenger RNA (mRNA), transfer RNA (tRNA), and