17.) a line through a circle or square means?
18.) draw two parents that have a male first and then a set of female twins.
19.) what are pedigrees used for? to track the presence or absence of a givin trai
20.) what is nondisjunction?
21.) down syndrome involves how many copies of chromosome 21?
22.) nondisjunction in females causes what syndrome? how does this happen?
23.) nondisjunction in males causes what syndrome? how does this happen?
24.) cystic fibrosis results from what specifically happening to dna bases in a single gene?
25.) what are the advantages of carrying on copy of sickle cell?
26.) what are the advantages of carrying one copy of the cystic fibrosis allele?
27.)what process is used to separate and analyze the different sizes of dna fragments?
gel electrophoresis