module 4

Question 1

S- phase

Answer 1

chromosomes & centrosomes are duplicated . sister chromatids are held together at centromere

Question 2

prophase 1

Answer 2

Homologus chromosomes bind together from synaptonemal complex forming a tetrad and the marked chaismata areas go over crossing over. and spindle fibers emerge from centrosomes

Question 3

metaphase 1

Answer 3

independant assortment happens

Question 4

Anaphase 1

Answer 4

spindle microtublus pull homologous chromosomes apart

Question 5

result meiosis 1

Answer 5

Genetic variation, 2 haploid cells with one homolgous chromosome pair each

Question 6

Meiosis II

Answer 6

Much of the same idea as mitosis. results in four haploid nduaghter cells with one sister chromatid each

Question 7

Gametogenesis

Answer 7

four daughter haploid cells –> sperm/eggs

Question 8

non disjunction

Answer 8

happens in older women (homologus chromsoomes are not sepereated)

Question 9

anuepoildy

Answer 9

odd ammount of chromosomes that isn’t normal

Question 10

Hersey and chase

Answer 10

shoed that dna is the biological holder of info

Question 11

monomers of dna replication

Answer 11

dnTPs

Question 12

replisome

Answer 12

molecular machine responsible for dna replication

Question 13

DNA exiciion

Answer 13

removes geenral area of misscoding, replaces it and seals it up with ligase

Question 14

Xeroderma Pigmentosum

Answer 14

example of inproper dna repairing from radiation

Question 15

exception to central dogma

Answer 15

reverse transcriptase / retroviruses / HIV

Question 16

What is genetic code?

Answer 16

redudnant (multiple possibliities for codons), unambiguous (one codon cant code for multiple AA), non-overlapping, and universal

Question 17

Start codon

Answer 17

AUG

Question 18

Stop codons

Answer 18

UAA, UAG, UGA

Question 19

Missesne

Answer 19

AA subsitiuatiuon

Question 20

Nonsense

Answer 20

AA is turned into stop codon

Question 21

Frameshift

Answer 21

the reading frame of codons is move over