genetics practice. o t t f f s s e __ what comes next?
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GENETICS PRACTICE
O T T F F S S E __
What comes next?
O T T F F S S E __
It’s EASY if you know the PATTERN!(Just like Punnett Squares)
NE
WO
1 2 3 4 5 6 7 8
HREE
OUR
IVE
IX
EVEN
IGHT
9
NINE
R r Y y
HETEROZYGOUSROUND YELLOW
PRACTICE MAKING GAMETES
WHAT ARE THE POSSIBLE GAMETES THIS PARENT CAN MAKE?
Each gamete shouldget one of each kindof gene
___________ ____________ _____________ _____________R Y r y r Y R y
RY Ry rY ry
RY
Ry
rY
ry
Sign of a ______________________ cross is a_____________ ratio in offspring.9:3:3:1
____ Round & Yellow
____ Round & green
____ Wrinkled & yellow
____ wrinkled & green
9
3
3
1
RRYY RRYy RrYY RrYy
RRYy RRyy RrYy Rryy
RrYY RrYy rrYY rrYy
RrYy Rryy rrYy rryy
heterozygous dihybrid
__________ratio is a clue that it’s a _________________________cross
____ ____________ TRAIT 1 ; ____________ TRAIT 2 ____ ____________ TRAIT 1; _____________ TRAIT 2
____ ____________ TRAIT 1; _____________ TRAIT 2
____ ____________ TRAIT 1; _____________ TRAIT 2
9
3
3
1
9:3:3:1HETEROZYGOUS TWO gene(DIHYBRID)
dominant dominant
dominant recessive
recessive dominant
recessive recessive
Making offspring with MULTIPLICATION
What is the probability? AaBBCcdd parent genome
What is the probability of producing a gamete with this gene combination?ABCd _____________________________
AbCd ______________________________
abcd _______________________________
What is the probability? AaBBCcdd X AabbCCDd parents
What is the probability of producing a offspring with this gene combination?AABbCcDd _____________________________
AaBBccdd______________________________
aaBbccDd_______________________________
What is the probability? AaBBCcdd parent genome
What is the probability of producing a gamete with this gene combination?ABCd _____________________________
Abcd ______________________________
Abcc _______________________________
What is the probability? AaBBCcdd X AabbCCDd parents
What is the probability of producing a offspring with this gene combination?AABbCcDd _____________________________
AaBBccdd______________________________
aaBbccDd_______________________________
PEDIGREES= male; doesn’t show trait
= female; doesn’t show trait
= shows trait
= carrier; doesn’t show trait
The genotype of F1 individuals in a tetrahybrid cross is AaBbCcDd X AaBbCcDdAssuming independent assortment of these four genes, what are the probabilities that F2 offspring will have the following genotypes?
aabbccdd ______________________________AaBbCcDd ______________________________AaBBCCdd ______________________________
A Wild type fruit fly (heterozygous for gray body and normal wings) is mated with a black fly with vestigial wings.OFFSPRING: 778- wild type785- black-vestigial158- black- normal wings162- gray body-vestigial wings
T t
t
t
Tt t t
Tt tt
IF GENE is AUTOSOMAL and RECESSIVE TO +Expect 1:1
http://www.exploratorium.edu/exhibits/mutant_flies/curly-wings.gif
50% -Dominant50% - Recessive
RY Ry rY ry
ry
ry
ry
ry
.1:1:1:1
____ Round & Yellow
____ Round & green
____ Wrinkled & yellow
____ wrinkled & green
4
4
4
4
RrYy Rryy rrYy rryy
RrYy Rryy rrYy rryy
RrYy Rryy rrYy rryy
RrYy Rryy rrYy rryy
__________ratio is a clue that it’s a _________________________cross
____ ____________ TRAIT 1 ; ____________ TRAIT 2 ____ ____________ TRAIT 1; _____________ TRAIT 2
____ ____________ TRAIT 1; _____________ TRAIT 2
____ ____________ TRAIT 1; _____________ TRAIT 2
9
3
3
1
9:3:3:1HETEROZYGOUS TWO gene(DIHYBRID)
dominant dominant
dominant recessive
recessive dominant
recessive recessive
A Wild type fruit fly (heterozygous for gray body and normal wings) is mated with a black fly with vestigial wings.OFFSPRING: 778- wild type785- black-vestigial158- black- normal wings162- gray body-vestigial wings
Is it 9:3:3:1?
Is it 3 Wild type : 1 black vestigial?
A Wild type fruit fly (heterozygous for gray body and normal wings) is mated with a black fly with vestigial wings.OFFSPRING: 778- wild type785- black-vestigial158- black- normal wings162- gray body-vestigial wings
What is the recombination frequency between these genes?
A Wild type fruit fly (heterozygous for gray body and normal wings) is mated with a black fly with vestigial wings.OFFSPRING: 778- wild type785- black-vestigial158- black- normal wings162- gray body-vestigial wings
What is the recombination frequency between these genes?
A Wild type fruit fly (heterozygous for gray body and red eyes) is mated with a black fly with purple eyes.OFFSPRING: 721- gray body/red eyes751- black body/purple eyes49- gray body/purple eyes45- black body/red-eyes
What is the recombination frequency between these genes?
Determine the sequence of genes along a chromosome based on the following recombination frequencies
A-C 20%A-D 10%B-C 15%B-D 5%
Determine the sequence of genes along a chromosome based on the following recombination frequencies
A-C 10%A-D 30%B-C 24%B-D 16%
Determine the sequence of genes along a chromosome based on the following recombination frequencies
A-B 8%A-C 28%A-D 25%B-C 20%B-D 33%
A Wild type fruit fly (heterozygous for gray body and red eyes) is mated with a black fly with purple eyes.OFFSPRING: 721- gray body/red eyes751- black body/purple eyes49- gray body/purple eyes45- black body/red-eyes
What is the recombination frequency between these genes?
Determine the sequence of genes along a chromosome based on the following recombination frequencies
A-B 8%A-C 28%A-D 25%B-C 20%B-D 33%
Determine the sequence of genes along a chromosome based on the following recombination frequencies
A-B 8%A-C 28%A-D 25%B-C 20%B-D 33%
Determine the sequence of genes along a chromosome based on the following recombination frequencies
A-C 10%A-D 30%B-C 24%B-D 16%
CABD
RY Ry rY ry
RY
Ry
rY
ry
Sign of a ______________________ cross is a_____________ ratio in offspring.9:3:3:1
____ Round & Yellow
____ Round & green
____ Wrinkled & yellow
____ wrinkled & green
9
3
3
1
RRYY RRYy RrYY RrYy
RRYy RRyy RrYy Rryy
RrYY RrYy rrYY rrYy
RrYy Rryy rrYy rryy
heterozygous dihybrid
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