Part K: Lecture 41

Question 1

hybridization

Answer 1

the process of an animal or plant breeding with an individual of another species or variety

Question 2

hybridization examples

Answer 2

petunias, citrus trees, wheat, mule (female horse x male donkey), sapiens x neanderthals

Question 3

diploids (def.)

Answer 3

two copies of each chromosome

Question 4

polyploidy (def.)

Answer 4

adults have more than two of each chromosome

Question 5

polyploidy: 3

Answer 5

triploid

Question 6

polyploidy: 4

Answer 6

tetraploid

Question 7

polyploidy: 6

Answer 7

hexaploid

Question 8

polyploidy: 8

Answer 8

octoploid

Question 9

hybrids (AB) are viable because _____

Answer 9

mitosis works

Question 10

hybrids (AB) are sterile because _____

Answer 10

meiosis fails in prophase I (no homologous chr —>can’t pair)

Question 11

tetraploid (AABB) are viable because _____

Answer 11

mitosis works

Question 12

tetraploid (AABB) are fertile because _____

Answer 12

meiosis works (homologous chr —> can pair)

Question 13

tetraploid formed when ___

Answer 13

hybrid forms and cytokinesis fails after mitosis (double the chr in adult cell)

Question 14

diploid 2n=14 ; n=7 –> tetraploid ???

Answer 14

2n=28 ; n=14

Question 15

triploid (AAA) are viable because _____

Answer 15

mitosis works

Question 16

triploid (AAA) are sterile because _____

Answer 16

meiosis fails (gametes have one or two of each chr)

Question 17

cultivated bananas don’t ____

Answer 17

have seeds because meiosis fails

Question 18

animals: hybridization and polyploidy

Answer 18

rare

Question 19

plants: hybridization and polyploidy

Answer 19

common

Question 20

humans: hybridization and polyploidy

Answer 20

double fertilization -> polyploidy
triploidy = non-viable usually