Chapter 15

Question 1

t/f: chromosomes undergo segregation and independent assortment

Answer 1

true

Question 2

what was different about Morgan’s experiments?

Answer 2

showed that specific genes were on specific chromosomes

Question 3

sex linked traits

Answer 3

appear on the x chromosome

Question 4

linked genes

Answer 4

located on the same chromosome

can be inherited together

Question 5

recombination of chromosomes

Answer 5

proves that offspring should resemble parents if genes are linked

no parent and offspring can be genetically idential

Question 6

the farther apart genes on a chromosome are…

Answer 6

the higher probability of a crossover

Question 7

SRY gene

Answer 7

sex determining region, codes for testes

only on Y chromosome

Question 8

sex-linked gene

Answer 8

a gene located on either sex chromosome

Question 9

nondisjunction

Answer 9

homologous chromosomes do not separate normally

Question 10

polyploidy

Answer 10

multiple sets of chromosomes

Question 11

aneuploidy

Answer 11

one or more chromosomes are present in extra copies or are deficient in number

can result in down’s syndrome, klinefelter’s, turner’s syndrome, trisomy x

Question 12

genomic imprinting

Answer 12

the phenotype of a mammalian trait depends on which parent passed along the allele for that trait

almost like sex linked on autosomes

Question 13

extranuclear genes

Answer 13

genes found in organelles in the cytoplasm

Question 14

inheritance of traits controlled by extranuclear genes depends on…

Answer 14

maternal parent

zygote’s cytoplasm comes from the egg

genes in mitochondria are passed from the mother to child

Question 15

nondisjunction in meiosis

Answer 15

homologous chromosomes don’t separate in meiosis I
OR
one set of sister chromatids doesn’t separate in meiosis II

Question 16

result of nondisjunciton

Answer 16

gametes have one more or one less chromosome causing a mutation