chapter 7

Question 1

where does life begin?

Answer 1

fertilized egg

Question 2

in animals, sexually reproducing adults form ___ from ___

Answer 2

1. Haploid gametes (n=23) 2. Diploid (2n=46)

Question 3

meiosis includes two nuclear divisions and is where

Answer 3

there are genetic distinct (haploid)

Question 4

mitosis is

Answer 4

where it is genetically identical (diploid)

Question 5

diploid cell

Answer 5

two homologous chromosomes

Question 6

when are chromosomes duplicated in interphase?

Answer 6

s phase

Question 7

prophase 1

Answer 7

cross over

Question 8

metaphase 1

Answer 8

aligned at the equatorial plane

Question 9

anaphase 1

Answer 9

homologs are separated, pulled to opposite poles

Question 10

telophase 1

Answer 10

new nuclear membrane

Question 11

cytokinesis 2

Answer 11

2 haploid daughters are formed

Question 12

meiosis 2 ends with

Answer 12

4 daughter cells, all haploid (single chromosomes)

Question 13

what colors are the father and mother’s chromosomes (in the illustration)

Answer 13

father (blue) ; mother (red)

Question 14

where does a chromosome crossover take place

Answer 14

non-sister chromatid of homologous chromosome

Question 15

recombinant chromosome

Answer 15

a mixture of maternal and parental chromosome

Question 16

non-recombinant chromosome

Answer 16

either maternal or parental (either or)

Question 17

what happens if there is an abnormality in the number of chromosomes?

Answer 17

possibly lethal or severe (exception of down syndrome and sex chromosomes)

Question 18

inversion

Answer 18

chromosome breaks off, flips, reattaches to the original spot

Question 19

translocation

Answer 19

breaks off and moves to a non-homologous chromosome (moves to one that’s not in it’s pair)

Question 20

reciprocal translocation

Answer 20

happens between two non-homologous chromosomes

Question 21

deletion

Answer 21

breaks off and is deleted