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BIOLOGY Human Heredity 2
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What does a homozygous gene look like?
Two capital letters or two lower case letters.
Ex
: GG or gg
What does a heterozygous gene pair look like?
One capital letter and one lower case letter.
Ex
: Jj
What does a dominant gene pair look like?
One capital letter and one lower case letter or two capital letters.
Ex
: Uu or UU
What does a recessive gene pair look like?
Two lower case letters.
Ex
: pp
What is a gene mutation?
Any chemical change that affects the DNA molecule
What is a chromosomal mutation?
A change that occurs in the number or structure of a chromosome
What is inversion?
A chromosomal mutation where a part of a chromosome becomes oriented in the reverse of its usual direction (mostly harmless)
What is duplication?
A chromosomal mutation where a segment of chromosome is repeated
What is deletion?
A chromosomal mutation where part of the chromosome is lost
What is translocation?
A chromosomal mutation where part of a chromosome breaks off and attaches to another nonhomologous chromosome
What is nondisjuction, and what is one example in humans?
A chromosomal mutation where there is a failure of homologous chromosomes to separate normally during meiosis
An example is Down Syndrome where there is a nondisjunction of chromosome 21, causing the embryo to have 3 21's instead of 2
What is a polyploidy, and what is an example in humans?
A chromosomal mutation where an organism has extra sets of chromosomes
An example is Klinefelter's Syndrome where there is an extra set of sex chromosomes and the embryo is XXY
Author
Natalie
ID
4911
Card Set
BIOLOGY Human Heredity 2
Description
human heredity
Updated
2010-01-24T03:17:31Z
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