Download DNA , Genes, and Chromosomes

DNA , Genes, and Chromosomes
B-4.2
Summarize the relationship among
DNA, genes, and chromosomes.
Key Concepts
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Chromosome
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DNA
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Gene
What You Already Know…
In the 7th grade, you
summarized how
genetic information is
passed from parents to
offspring using the
terms genes,
chromosomes, inherited
traits, genotype,
phenotype, dominant
traits, and recessive
traits.
It is Essential For You to Know…
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DNA, genes and chromosomes compose
the molecular basis of heredity.
OBJECTIVES
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Summarize the relationship among DNA,
genes, and chromosomes.
Recall the basic structure of
chromosomes and genes.
Illustrate or interpret an illustration of
the relationship of a chromosome, DNA,
and genes using words or diagrams.
Vocabulary
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Chromosome
DNA
Gene
Genes
Genes are located on chromosomes in the
cell’s nucleus. Chromosomes are long
threads of DNA tightly coiled.
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Each organism must inherit a single copy of
every gene from both its parents.
When an organism produces its own gametes
those 2 sets of genes must be separated from
each other so that each gamete contains just
one set of genes.
What Exactly is a Gene?
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A gene is a section of DNA in a
specific region of a specific
chromosome.
Genes code for specific proteins to
be produced, which cause specific
characteristics in living things.
There are dominant and recessive
forms of genes.
Each chromosome consists of
hundreds of genes determining the
many proteins for an individual
organism.
Zoom in on a Chromosome