Chapter 15 Flashcards
Genes are located in certain positions which determines inheritance
Chromosome theory of inheritance
What does the SRY gene do?
Development of the testes
Gene on a sex chromosome
Sex-linked gene
The inactive X in each cell condense into an object located along the nuclear envelope
Barr body
How is the X chromosome inactivated?
X chromosome forms a barr body which occurs randomly and independently
2 or more genes on the same chromosome that tend to be inherited together
Linked genes
When does crossing over occur?
Prophase 1
Genetic map based on recombination frequencies
Linkage map
Homologs fail to move apart during meiosis 1 or sister chromatids fail to separate during meiosis 2
Nondisjunction
1 or more chromosome are present with extra copies or a deficient of numbers
Aneuploidy
Diploid cell has 1 copy of a chromosome instead of 2
Monosomy
Diploid cell has 3 copies of a chromosome
Trisomy
Have more than 2 chromosome sets
Polyploidy
Removes a chromosomal segment
Deletion
Repeats a segment
Duplication
Reverses a segment within a chromosome
Inversion
Moves a segment from one chromosome to a nonhomologous chromosome
Translocation
Expression of an allele in offspring depends on whether the allele is inherited from the male or female parent
Genomic imprinting
Genes that have been inherited only from your mom
Mitochondrial DNA
