Activities
Cell Division
Chapters 12-15
• Is this one n or 2n? n
• Identify
– Chromatid (DNA)
– centromere
– chromosome arm
Identify the parts pointed at
• name the stage
• metaphase
Spindle from centrioles
• what stages
come before and
after this one?
• Prometaphase (or
prophase)
chromosome
centrioles
what organism is
this tissue from?
plant
name the stages A-E
E telophase
F
D prophase
which of these is not
an M stage?
B metaphase
interphase
where in the plant you
C
find this tissue?
interphase meristem
what is "F"? Cell plate
A metaphase
• name the stage
anaphase
• what stage comes
before and after it?
Metaphase; telophase
• if this is a somatic
cell and n=10,
how many chromosomes will it have? 20
• 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
• Is this cell going through
mitosis or meiosis?
mitosis
• How do you know?
There has been no exchange of DNA between
homologous chromosomes
• 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
Prophase I Metaphase I Anaphase I Telophase I
• zsdvsfbdb
Prophase II
Metaphase II
Anaphase II
Chromosome number = 2n = 20
Is this mitosis or meiosis? meiosis
Chromosome number = n = 10
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
Telophase II
B
•
•
•
•
•
•
Name the form of cell division
A
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) n or 2n?
of chromosomes in B, C and E.
n or 2n? 2n
D
E
n or 2n? n
C
•
•
•
•
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 who’s 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
Using the letter R, draw a Punnett square with a
homozygous dominant and a homozygous recessive and
find the F1.
j
J
Jj
J
Jj
j
Jj
Jj
All F1 will be heterozygous (Jj)
Law of Segregation
PP
• P= dominant and p=ressesive
• 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?
pp
P
p
F1
Pp
F1 gametes
P
p
P
p
P
PP
F2
Pp
p
Pp
pp
YYRR
Law of Independant
Assortment
• 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)
yyrr
YR
yr
YyRr
YR
F1
Yr
yR
yr
YYRr
YyRR
YyRr
YYrr
YyRr
Yyrr
YR
YYRR
Yr
YYRr
yR
YyRR
YyRr
yyRR
yyRr
YyRr
Yyrr
yyRr
yyrr
yr
F2
Incomplete
dominance
• 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.
1:2:1 red (CRCR), pink (CRCW), white
(CWCW)
CRCR
CWCW
CR CW
CRCW
(pink)
CR
CR
CR
CW
CW
CRCR CRCW
CW
CRCW CWCW
Codominance
IAD
•
•
•
•
•
•
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
IBD
IAd
IBd
IAIBDD
AB+
IAIADd
A+
IAIBDd
AB+
IAD
IAIADD
A+
IBD
IAIBDD
AB+
IBIBDD
B+
IAIBDd
AB+
IBIBDd
B+
IAd
IAIADd
A+
IAIBDd
AB+
IAIAdd
A-
IAIBdd
AB –
IBIBDd
B+
IAIB dd
AB -
IBIBdd
B-
IBd
IAIBDd
AB+
• what is the difference between the next
gene mutations Look in book.
– Deletion
– Duplication
– Inversion
– reciprocal translation
define:
• syndrome
• disorder
• aneuploid
• trisomic
• oogenesis