Standard 2e Preknowledge
2e) Students know why approximately half of an individual’s DNA sequence comes from each parent.
CALIFORNIA FRAMEWORKS SUMMARY:
Chromosomes are composed of a single, very long molecule of double-stranded DNA and proteins. Genes are defined as segments of DNA that code for polypeptides (proteins). During fertilization half the DNA of the progeny comes from the gamete of one parent, and the other half comes from the gamete of the other parent.