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DIHYBRID CROSSES

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DIHYBRID CROSS TWO gene traits Section 11-3 Figure 11-10 Independent Assortment in Peas 1. _____ what _____ are 2. _____correct _____ square ... – PowerPoint PPT presentation

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Title: DIHYBRID CROSSES


1
DIHYBRID CROSSES
  • (2 traits)


http//mac122.icu.ac.jp/BIOBK/BioBookgenintro.html
2
  • Mendel also asked the question?
  • Does the gene that determines if a seed
  • is round or wrinkled have anything to
  • do with the gene for seed shape?
  • Must a seed that is yellow
  • also be round?

3
MAKING A CROSS with ___________________________
____________
TWO gene traits
DIHYBRID CROSS
  • A Punnett square for a DIHYBRID CROSS looks like
    this

4
Figure 11-10 Independent Assortment in Peas
Section 11-3
5
LETS MAKE A DIHYBRID CROSS
  • HOMOZYGOUS
  • YELLOW ROUND

HOMOZYGOUS GREEN WRINKLED
rryy
RRYY
1. ___________ what _________________ are 2.
________correct__________ square __________ 3.
______ possible_______________________ 4. ______
boxes with _____________________ 5. Determine
____________of_____________
____________
Figure out parent alleles Choose
Punnett size Put in
parent gametes Fill in offspring
combinations probabilities
phenotypes
genotypes
6
  • LAW OF __________________________
  • the factors are distributed to gametes
    independently of other factors

INDEPENDENT ASSORTMENT
Image modified from http//anthro.palomar.edu/me
ndel/mendel_1.htm
7
PRACTICE MAKING GAMETES
WHAT ARE THE POSSIBLE GAMETES THIS PARENT CAN
MAKE?

HOMOZYGOUS ROUND YELLOW
Each gamete shouldget one of each kindof gene
R R Y Y
R Y
R Y
R Y
R Y
___________ ____________ _____________
_____________
8
PRACTICE MAKING GAMETES
WHAT ARE THE POSSIBLE GAMETES THIS PARENT CAN
MAKE?

Each gamete shouldget one of each kindof gene
HOMOZYGOUS WRINKLED GREEN
r r y y
r y
r y
r y
r y
___________ ____________ _____________
_____________
9
PRACTICE MAKING GAMETES
WHAT ARE THE POSSIBLE GAMETES THIS PARENT CAN
MAKE?

HETEROZYGOUSROUND YELLOW
Each gamete shouldget one of each kindof gene
R r Y y
R Y
r y
r Y
R y
___________ ____________ _____________
_____________
10
RrYy RrYy RrYy RrYy RrYy RrYy RrYy
RrYy RrYy RrYy RrYy RrYy RrYy
RrYy RrYy RrYy
RrYy
100 of offspring _______ genotype
_______________________ phenotype
ROUND YELLOW
11
MAKE ANOTHER CROSS
HETEROZYGOUSROUND YELLOW
HETEROZYGOUSROUND YELLOW
X
R r Y y
R r Y y
12
POSSIBLE PARENT GAMETES?
RY
rY
ry
Ry
13
____ Round Yellow ____ Round
green ____ Wrinkled
yellow ____ wrinkled green
9
RRYY RRYy RrYY RrYy RRYy RRyy RrYy
RryyRrYY RrYy rrYY rrYy RrYy Rryy
rrYy rryy
3
3
1
heterozygous dihybrid
Sign of a ______________________ cross is
a _____________ ratio in offspring.

9331
14
9
____ ____________ TRAIT 1 ____________ TRAIT
2 ____ ____________ TRAIT 1
_____________ TRAIT 2 ____ ____________ TRAIT
1 _____________ TRAIT 2 ____ ____________
TRAIT 1 _____________ TRAIT 2
dominant dominant
3
dominant recessive
3
recessive dominant
1
recessive recessive
__________ratio is a clue that its a
____________________________cross
9331
HETEROZYGOUS TWO gene

15
PRACTICE MAKING GAMETESfor DIHYBRID CROSSES
http//www.emc.maricopa.edu/faculty/farabee/BIOBK/
BioBookTOC.html
16
What are the possible gametes?
R R T T
  • pure round pure tall __________
  • ____ ____ _____ ______
  • What gametes can it produce?

?
?
?
?
R T
R T
R T
R T
17
What are the possible gametes?
T t R R
  • Heterozygous Tall __________
  • pure round
  • ____ ____ _____ ______
  • What gametes can it produce?

?
?
?
?
T R
T R
t R
t R
18
What are the possible gametes?
T t r r
  • Hybrid tall __________
  • pure wrinkled
  • ____ ____ _____ ______
  • What gametes can it produce?

?
?
?
?
T r
T r
t r
t r
19
What are the possible gametes?
T t R r
  • Heterozygous tall __________
  • hybrid round
  • ____ ____ _____ ______
  • What gametes can it produce?

?
?
?
?
T R
T r
t r
t R
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