Topic 10

Question 1

linkage

Answer 1

two genes/alleles linked together, present on same chromosome. cannot assort independantly
- (tendancy of chromosomes to stick together)

Question 2

crossing over

Answer 2

intrachromosomal recombo during meiosis when a homologous pair make contact, exchange of genetic variation

Question 3

uniparental inheritance

Answer 3

genes to all offspring from one parent only

• genomic imprinting
• mtDNA

Question 4

• genomic imprinting

Answer 4

• genomic imprint
  . gene inactivation (maternal or paternal)
  . 3 alleic/genotype variants occur

Question 5

• mtDNA

Answer 5

• mtDNA
  . maternal inheritance, mitochondrial disease
  . replication and transmission of extrachrimosomal genetic info from mitochondria,
  . phenotypic difference controlled by cytoplasmic factors