17.2

Question 1

exceptions to mednelian inheritance

Answer 1

epigentic mechanisms: regulators of gene function/ expression that do not involve a change in the DNA seuence
2. DNA from organelle genomes

Question 2

epigentic mechansim: dosage compensation

Answer 2

ensures equal expression of genes from the sex chomosomes
in each human female cell, 1 of the X chromosomes is inactivated and is highly condensed into a barr body

Question 3

x chromosme inactivation and genetic mosaics

Answer 3

females heterozygous for genes on the x chromosome are genetic mosaics

Question 4

epigenetic mechanims: genomic imprinting

Answer 4

imprinted genes are inactived
genes are inactivated based on whoch parental line the gene was inherited