Science - 2018-19

LS.12 a-b - DNA & Heredity

The student will investigate and understand that organisms reproduce and transmit genetic information to new generations. Key concepts include
a) the structure and role of DNA; and
b) the function of genes and chromosomes.

Bloom's Levels:  Analyze; Understand

Adopted: 2010


  • All living things reproduce to produce more of their own kind.

  • I can explain why I have characteristics of both of my parents.


  • DNA is a double helix molecule.
  • DNA is a molecule that includes different components — sugars, nitrogenous bases, and phosphates. The arrangement of the nitrogenous bases within the double helix forms a chemical code.
  • Chromosomes are strands of tightly wound DNA. 
  • Genes are sections of a chromosome that carry the code for a particular trait. An allele is an alternate form of a gene. 


In order to meet this standard, it is expected that students will

a)  recognize the appearance of DNA as double helix in shape.

explain that DNA contains coded instructions that store and pass on genetic information from one generation to the next.

explain the necessity of DNA replication for the continuity of life.

b)  explain the relationship among genes, chromosomes, and alleles.

demonstrate variation within a single genetic trait.

distinguish between dominant and recessive traits.


DNA, double helix, chromosomes, genes, Medelian genetics, allele, dominant allele, recessive allele, genotype, phenotype, Punnett square, genetic engineering, inherited, acquired, sugars, nitrogenous bases, phosphates, Gregor Mendel, Rosalind Franklin, Watson & Crick, genetics, heredity

Updated: Jun 29, 2018