GENETICS PracticeChapter 11

The parents in this cross are _____________ Homozygous Heterozygous

Heterozygous

If G is dominant for green pods and g is recessive for yellow pods, what percentage of the offspring will have green pods? _______% 75

GG Gg

Gg gg

G gG

g

B b

B

b

The genotype of the offspring in the blue box is _______

bb

The offspring in the blue box is homozygous heterozygous

homozygous

B b

B

b

In guinea pigs black fur (B) is dominant over brown fur (b). The Punnett square for a cross between a HETEROZYGOUS black guinea pig and a PURE brown guinea pig would look like

This is the Correct setup

Heterozygous = BbPure brown = bb

B B

b

b

B b

b

b

B b

B

B

Another name for pure is _________________homozygous

What are the possible phenotypes of their offspring?

(% and color)

Red throats (R) are dominant over white (r)throats in Goonie birds.

Make a cross between a PURE RECESSIVE and a HETEROZYGOUS Goonie bird.

50% red throats 50% white throats

Rr rr

Rr rr

R r

r

r

What are the possible phenotypes of their offspring?

(% and color)

Black eyes (B) are dominant over red eyes (b) in rats.

Make a cross between two HETEROZYGOUS rats.

75 % black eyes 25% red eyes

B b

B b

BB Bb

Bb bb

The parents in this cross are _____________ Homozygous Heterozygous

Homozygous

If W is dominant for long wings and w is recessive for short wings, what percentage of these offspring will have short wings? _______%

0% only ww makes it short

Who is the “Father of Genetics”?

Gregor Mendel

Which of the following genotypes could be from a HETEROZYGOUS organism?

TT Rr Ww bb XX Ss

Rr Ww Ss

What kind of cross is this?

Pure dominant X pure recessiveHeterozygous X heterozygousHeterozygous X homozygousHybrid recessive X hybrid pure

Heterozygous X Homozygous

Another name for heterozygous is _______________hybrid

What is the probability the offspring will have straight tails?

In Reebops curly tails (T) are dominant over straight tails (t).

Make a cross between a HOMOZYGOUS DOMINANT and a HOMOZYGOUS RECESSIVE Reebop.

0% All will be Curly tailed (Tt)

Tt Tt

Tt Tt

T T

t

t

BT bt bT Bt

What are the possible genotypes?

Bb x Tt

______ ______ _______ _______

What type of gametes can this organism produce?

BB x TT

______ ______ _______ _______BT BT BT BT

A a

A

a

The genotype of the offspring in the blue box is _______ homozygous heterozygous

heterozygous

How many of the offspring from this cross will show the dominant characteristic?

¾ (75%) – AA and Aa

G g

G GG Gg

g gg

G is dominant for green pods.g is recessive for yellow pods.

What is the genotype of the offspring in the shaded box?

Gg

What is the phenotype of the offspring in the shaded box?

Green pods

Which of the following is NOT TRUE?

Genotype determines phenotype Alleles are different forms of the same gene. Genotype is the way the genes make you look. Organisms with different genotypes

can have the same phenotype.

T

T

F

T

Tt and TT both look tall

What will the offspring be like?

(% and color)

Purple (P)is the dominant color for monsters. Yellow is recessive (p).Make a cross between a HOMOZYGOUS purple and a yellow monster.

100% purple

Pp Pp

Pp Pp

P P

p

p

What genotype would a PURPLE dad have to be to make a yellow monster baby with a Purple (Pp) mom monster?

P p?

?

pp

Pp

Dad needs to have: a little p to give one to the baby a big P to be purple himself

In this cross: TtYy X TtYy

What is the probability the offspring will be:

short AND green? ____/16

Short AND yellow? ____/16

Tall AND green? ___/16

tall AND yellow? ___/16

1

T = Tall Y = yellow peast = short y = green peas

3 3

9

In this cross: YYRR X yyRRBe careful!

What is the probability the offspring will be:

Yellow peas AND white flowers? ____/16

Green peas AND red flowers? ____/16

Yellow peas AND red flowers? ___/16

Green peas AND white flowers? ___/16

0

Y = yellow peas R = red flowersy = green peas r = white flowers

0 16

0

In this cross: TtRr X TtRt

What is the probability the offspring will be:

Tall AND white? ____/16

Short AND red? ____/16

Tall AND red? ___/16

Short AND white? ___/16

3

T = Tall R = redt = short r = white

3 9

1

If you cross a homozygous RED flowered four o’clock plant with a homozygous WHITE flowered plant, ALL of the offspring produced have PINK flowers.

This type of inheritance in which the heterozygote (Rr) shows a blending of traits is called __________.

A. Dominant/recessive inheritance B. Co-dominance

C. Incomplete dominance

Incomplete dominance

A oA AA Ao

B AB Bo

F A & B are codominant

The alleles for blood type show 2 kinds of inheritance..

The following statements are TRUE or FALSE?

A is dominant over B.O is dominant over A.A is dominant over O.B and A are co-dominantA is incompletely dominant over O.O is recessive to A and to B

F O is recessive to both A & B TTFT

TR Tr tR tr

TR

Tr

tR

tr

Tall = T short = t R= round r=wrinkled seeds seeds

TtRr X TtRr

TTRR TTRr TtRR TtRr

TTRr TTrr TtRr Ttrr

TtRR TtRr ttRR ttRr

TtRr Ttrr ttRr ttrr

In a DIHYBRID HETEROZYGOUS cross the offspring that are

9/16 are _______________ for both traits.

3/16 are _____________ for one trait and _____________ for the other.

1/16 are _____________ for both traits.

Dominant

FILL IN THE BLANKS WITH THE WORDS Dominant OR Recessive

DominantRecessive Recessive

An organism has the genotype Xy.

What are the possible sperm it can produce? ______ ______

THINK ABOUT IT:If females have an XX genotype and can only give X genes, which parent is the one that determines whether the baby is a boy or girl?

X y

Father ;The mother always gives an XIf the father gives a y, it’s a boy.If the father gives an X; it’s a girl.

This is an example of a DIHYBRID cross.

Which pattern of phenotypes will be seen in the offspring?

9:3:3:1

How many offspring will be Short AND Round? ______

Short AND wrinkled? ______

3/16Recessive and dominant

Recessive and recessive HINT:9- dominant for both3- recessive and dominant3- dominant and recessive1- recessive and recessive

1/16

What are the 3 different kinds of inheritance you learned about?

Dominant/recessiveIncomplete dominanceCo-dominance

Offspring of the P1 generation are called ______

F1

Which of the following crosses would you expect to see a 9:3:3:1 ratio in the offspring?

SSYY X ssyy SsYy X SsYy ssYY X SSyy

SsYy X SsYy9:3:3:1 ratio is seen in dihybrid crosses

What do we call the offspring of the F1 generation?

F2

Which of the following genotypes could be from a HOMOZYGOUS RECESSIVE organism?

TT bb Rr Ww tt XX aa

bb tt aa

What are the probable blood types of the offspring?

What are the possible offspring of a cross between a blood type AB mom and a type O dad?

50% Type A 50% Type B

Ao Bo

Ao Bo

A B

O

O

Wilma and Fred are going to have a baby.Fred in AA and Wilma is oo.

What are the possible blood types of their baby?

100% will have A type blood

Ao Ao

Ao Ao

A A

o

o

Wilma and Fred are going to have a baby.Fred in AA and Wilma is oo.

What are the possible blood types of their baby?

100% will have A type blood

Ao Ao

Ao Ao

A A

o

o

RT rt rT Rt

What type of gametes can this organism produce?

RrTt

______ ______ _______ _______

What type of gametes can this organism produce?

WwGg

______ ______ _______ _______WG wg wG Wg