These notes cover the sixth chapter of the course, including the lecture, readings, and essential discussions. Whether you missed a class, need to review for exams, or want a concise summary of complex topics, these notes are your go-to resource. They are ideal for students who want to save time a...
what type of info is stored in DNA? how different is your DNA from the
person sitting next to you?
DNA AND GENES:
all life on earth uses dna as the genetic material
the nucleus of every eukaryotic cell contains ling strands of dna called
chromosomes
each chromosome contains genetic info in genes
a gene is a length of dna that codes for the proteins that make up our
bodies
genes are the unit of inheritance
A CLOSER LOOK AT THE CHROMOSOME
inside the nucleus the chromosomal sna is wound around proteins;
together they form chromatin
most of the time chromosomes are unraveled as loose chromatin
every human body cell has 46 chromosomes
how many chromosomes did you inherit from your mother?
CHROMOSOME AT CELL DIVISION HAVE UNIQUE PROPERTIES
at cell division chromosomes: become tightly pack, and diplicate
pairs of duplicated chromosomes are called sister chromatids
CHROMOSOMES DUPLICATE PRIOR TO CELL DIVISION
sister chromatids are joined centromere
formation of sister chromatids means the cell is preparing to divide
CELLS HAVE REGULAR CYCLES OF GROWTH AND DIVISION
the cell cycle is an ordered sequence of events in the lifetime of a cell
there are two broad phases:
1. interphase
•90% of cell's lifetime
•normal cell functions
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