Chapter 12 Flashcards
Diploid human cell contains how many base pairs
6 billion
The nucleus contains an information rich…?
Genome
Genome
A complete set of genetic material in an organism
Histones
Small protein spools used to pack DNA
Venter vs. Collins
Scientists determined the order of the DNA bases
Symptoms of Down syndrome or trisomy 21
Below average height
Heart defects
Impaired immune system
Mental disability
Nondisjunction
Homologous chromosomes fail to separate during meiosis
What may cause nondisjunction in some cases
The age of the mother
Duplication
A part of the chromosome is repeated
Deletion
A fragment of the chromosome is lost
Inversion
A fragment of the original chromosome is reversed
Translocation
Two different chromosomes exchange parts
Transposon
Aka jumping genes an enzyme attaches to the transposing gene and another gene at the same time, the transposing is cut and inserted at the new locations disrupting the other gene
Disorders inherited as recessive traits
Albinism
Tay Sachs disease
Cystic fibrosis etc.
An individual will often… before they can pass on their dominant allele to offspring
Die
