QCAA Biology Genetics and heredity

Both spermatogenesis and oogenesis are forms of meiosis that result in the production of haploid gametes ($n$) from diploid germ cells ($2n$).

Spermatogenesis results in four equally sized, functional sperm cells, whereas oogenesis involves unequal cytokinesis, producing one large functional ovum and smaller, non-functional polar bodies.

Spermatogenesis begins at puberty and continues throughout life, whereas oogenesis begins during fetal development, arrests, and resumes at puberty.

Both processes begin with diploid stem cells (spermatogonia and oogonia) that differentiate into diploid primary spermatocytes and oocytes before undergoing meiosis.

Cutting DNA at specific sites is the function of restriction enzymes (endonucleases), not PCR.

The primary purpose of Polymerase Chain Reaction (PCR) is to amplify specific DNA sequences, creating millions of copies from a small initial sample.

Determining the specific order of nucleotides is the goal of DNA sequencing, whereas PCR is used only for amplification.

Separating DNA fragments based on size is achieved through gel electrophoresis, not PCR.