One of the bases found in the dna and rna molecule a

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One of the bases found in the DNA and RNA molecule; a pyrimidine Deoxyribonucleic acid (DNA) A nucleic acid that controls the structure of proteins and hence determines inherited characteristics; genes are portions of the DNA molecule that fulfill specific functions Deoxyribose A five-carbon sugar found in the DNA molecule Dizygotic twins Fraternal twins; twins derived from separate zygotes Dominant When in heterozygous genotype only one allele is expressed in the phenotype, that allele is said to be dominant Environment Everything external to the organism Estrus Time period during which the female is sexually receptive Gamete A sex cell produced by meiosis that contains one copy of a chromosome set (23 chromosomes in humans). In a bisexual animal, the sex cell is either a sperm or an ovum Genes A section of DNA that has a specific function Genotype The genetic constitution of an individual Guanine One of the bases found in the DNA and RNA molecules; a purine Heterozygous Having two different alleles of a particular gene Homologous chromosomes Chromosomes of the same pair containing the same genes but not necessarily the same alleles Homozygous Having two like alleles of a particular gene; homozygous dominant when the allele is dominant and homozygous recessive when the allele is recessive Homozygous dominant Having two dominant alleles of the same gene Homozygous recessive Having two recessive alleles of the same gene Hybrids Individual that is the result of a cross or mating between two different kinds of parents Independent assortment A Mendelian principle that states that differing traits are inherited independently of each other. It applies only to genes on different chromosomes Karyotype The standardized classification and
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arrangement of chromosomes Linkage Association of genes on the same chromosome Lipids Class of compounds that includes fats, oils, and waxes Meiosis Form of cell division occurring in specialized tissues in the testes and ovaries that leads to the production of gametes or sex cells Messenger RNA (mRNA) Form of RNA that copies the DNA code in the nucleus and transports it to the ribosome Mitochondria Bodies found in the cytoplasm that convert the energy in the chemical bonds of organic molecules into ATP Mitochondrial DNA (mtDNA) A double-stranded loop of DNA found within the mitochondria; there can be as few as one or as many as a hundred mitochondria per cell, and each mitochondrion possesses between 4 and 10 mtDNA loops Mitosis Form of cell division whereby one-celled organisms divide and whereby body cells divide in growth and replacement Model A representation of a phenomenon on which tests can be conducted and from which predictions can be made Molecules Unit composed of two or more atoms linked by a chemical bond Monozygotic twins Identical twins; derived from a single zygote Nuclear DNA (nDNA) DNA found within the nucleus of the cell Nuclear membrane A structure that binds the nucleus within the cell Nucleic acids
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