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 ______________________________

ABcd _______________________________

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 ______________________________

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: 721- wild type696- black-vestigial236- black- normal wings212- 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-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 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%