Activities Cell Division

1
Activities Cell Division

• Chapters 12-15

2

• Is this one n or 2n? n
• Identify
• Chromatid (DNA)
• centromere
• chromosome arm

3
Identify the parts pointed at

• name the stage
• metaphase
• what stages come before and after this one?
• Prometaphase (or prophase)

Spindle from centrioles
chromosome
centrioles
4
what organism is this tissue from? plant name the
stages A-E which of these is not an M
stage? interphase where in the plant you find
this tissue? meristem what is "F"? Cell plate
E telophase
B metaphase
C interphase
F
A metaphase
D prophase
5

• name the stage
• anaphase
• what stage comes
• before and after it?
• Metaphase telophase
• if this is a somatic
• cell and n10,
• how many chromosomes will it have? 20

6

• name the stage
• interphase
• is it part of mitosis?
• no
• give a visible characteristic.
• Nuclei are visible, cytoplasm has one color tone.
• what happens during this stage, why is it
  important?
• DNA replication, to have chromosomes ready for
  the daughter cells

7

• Is this cell going through mitosis or meiosis?
• mitosis
• How do you know?
• There has been no exchange of DNA between
  homologous chromosomes

8

• Is this cell going through
• mitosis or meiosis? meiosis
• How do you know? Crossing-over is taking place
  between homologous chromosomes
• What specific stage is it in?P1
• What special process is
• going on? Crossing over
• What is the importance of it? Genetic variability
  in the population

9
Prophase I Metaphase I Anaphase I Telophase
I

• zsdvsfbdb

Prophase II Metaphase II Anaphase II
Telophase II
Chromosome number 2n 20
Chromosome number n 10
Is this mitosis or meiosis? meiosis Name all the
stages. If 2n 20 what is the number of
chromosomes on each stage? What type of cell
will this occur in? gamete, reproductive cell
10
B
n or 2n? 2n

• Name the form of cell division seen here. meiosis
• What is the name of the process seen in the
  second picture? (D)
• Crossing over
• What stage of meiosis does the second picture
  represent? PI
• Why is 'D' important for human race and species
  in general? Genetic variability
• Name the stages with letters C E C telophase
  II, E metaphase I
• Determine the number (n or 2n) of chromosomes in
  B, C and E.

A
D
n or 2n? n
E
C
n or 2n?
11

• What is a homozygous? Same exact genes in each
  locus
• What is a heterozygous? Different genes in each
  pair of loci
• what is a dominant allele? The one that
  overpowers the recessive
• What is a recessive allele? The one whos
  expression is overpower by the dominant trait
• What is complete dominance, incomplete dominance
  and codominance? Look in book
• What is F1 and F2? F1 is first generation, F2 is
  second generation

12
Using the letter R, draw a Punnett square with a
homozygous dominant and a homozygous recessive
and find the F1.

• J J
• j Jj Jj
• j Jj Jj
• All F1 will be heterozygous (Jj)

13
Law of Segregation
PP pp
P p

• P dominant and pressesive
• using the symbols given
• fill in the blanck spaces with the proper symbols
• what is the genotype of each of the F1?
• Using two heterozygotes of F1, make a Punnet
  square and find the F2.
• What are the proportions of the phenotype in the
  F2?
• What are the proportions of the genotype in F2?

F1
Pp
P p
P p P PP
Pp p Pp
pp
F1 gametes
F2
14
Law of Independant Assortment
YYRR yyrr
YR yr

• Fill in the gametes and Punnett square
• What are the genotype and phenotype of F1? Yellow
  and smooth
• What are the proportions of the genotype and
  phenotype of F2?
• 9 yellow and smooth (Y_R_)
• 3 yellow and rough (Y_rr)
• 3 green and smooth (yyR_)
• 1 green and rough (yyrr)

F1
YyRr
YR Yr
yR yr
YR YYRR YYRr YyRR
YyRr Yr
YYRr YYrr YyRr Yyrr
yR YyRR YyRr
yyRR yyRr yr
YyRr Yyrr yyRr yyrr
F2
15
Incompletedominance
CRCR CWCW CR
CW CRCW
(pink) CR CW
CR CW CR CRCR CRCW
CW CRCW CWCW

• Write down the symbols of each generation (P, F1
  and F2)
• Write down the genotypes and gametes produced by
  P and F1.
• Fill in the gametes in the Punnett square and
  find out the genotypes and their proportions of
  the possible F2 offspring.
• 121 red (CRCR), pink (CRCW), white (CWCW)

16
Codominance
IAD IBD
IAd IBd IAD IAIADD
IAIBDD IAIADd IAIBDd A
AB A
AB IBD IAIBDD IBIBDD IAIBDd
IBIBDd AB B
AB B IAd IAIADd
IAIBDd IAIAdd IAIBdd
A AB A -
AB IBd IAIBDd IBIBDd
IAIB dd IBIBdd AB
B AB - B -

• Put the possible gametes of generation P, both of
  blood type AB (assuming the Rh is heterozygous)
• Find out the genotype and phenotype of the F1
• Determine the proportions of each one of the
  phenotypes of F1.
• AB 6 A 3
• AB - 2 B 3
• A - 1 B - 1

17

• what is the difference between the next gene
  mutations Look in book.
• Deletion
• Duplication
• Inversion
• reciprocal translation

18

• define
• syndrome
• disorder
• aneuploid
• trisomic
• oogenesis