BIOD351 MODULE 1 2026 MASTER REVISION
NOTES AND PRACTICE SET
◉ What is the continuity of life based on? Answer: The continuity of
life is based on cell division.
◉ What is a gene? Answer: A gene is a segment of DNA that encodes
for RNA and/or proteins.
◉ What happens to genetic information before cell division?
Answer: All genetic information is replicated.
◉ What is the diploid number of chromosomes in human somatic
cells? Answer: The diploid number is 46 (2n = 46).
◉ How many sets of chromosomes are in a diploid body cell?
Answer: There are two sets of chromosomes in a diploid body cell.
◉ What are homologous chromosomes? Answer: Homologous
chromosomes are pairs of chromosomes that have the same length
and carry the same alleles controlling the same inherited characters.
, ◉ What are the sex chromosomes for human females and males?
Answer: Human females have XX sex chromosomes, while human
males have XY.
◉ What maintains the chromosome number during reproduction?
Answer: Sexual reproduction and mitosis maintain the chromosome
number.
◉ What is the haploid number of chromosomes in humans? Answer:
The haploid number is 23 (n = 23).
◉ What is the role of cell division in multicellular organisms?
Answer: Cell division is used for development from a fertilized cell,
growth, and renewal & repair.
◉ What is the significance of genetic variation? Answer: Genetic
variation is crucial for evolution and the adaptation of species.
◉ What are the two types of reproduction discussed? Answer:
Asexual and sexual reproduction.
◉ What is the significance of the S phase in the cell cycle? Answer:
The S phase is when DNA replication occurs, resulting in two
identical sister chromatids for each chromosome.
NOTES AND PRACTICE SET
◉ What is the continuity of life based on? Answer: The continuity of
life is based on cell division.
◉ What is a gene? Answer: A gene is a segment of DNA that encodes
for RNA and/or proteins.
◉ What happens to genetic information before cell division?
Answer: All genetic information is replicated.
◉ What is the diploid number of chromosomes in human somatic
cells? Answer: The diploid number is 46 (2n = 46).
◉ How many sets of chromosomes are in a diploid body cell?
Answer: There are two sets of chromosomes in a diploid body cell.
◉ What are homologous chromosomes? Answer: Homologous
chromosomes are pairs of chromosomes that have the same length
and carry the same alleles controlling the same inherited characters.
, ◉ What are the sex chromosomes for human females and males?
Answer: Human females have XX sex chromosomes, while human
males have XY.
◉ What maintains the chromosome number during reproduction?
Answer: Sexual reproduction and mitosis maintain the chromosome
number.
◉ What is the haploid number of chromosomes in humans? Answer:
The haploid number is 23 (n = 23).
◉ What is the role of cell division in multicellular organisms?
Answer: Cell division is used for development from a fertilized cell,
growth, and renewal & repair.
◉ What is the significance of genetic variation? Answer: Genetic
variation is crucial for evolution and the adaptation of species.
◉ What are the two types of reproduction discussed? Answer:
Asexual and sexual reproduction.
◉ What is the significance of the S phase in the cell cycle? Answer:
The S phase is when DNA replication occurs, resulting in two
identical sister chromatids for each chromosome.
