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GENETICS Practice Chapter 11. G g . The parents in this cross are _____________ Homozygous Heterozygous. Heterozygous. G g. If G is dominant for green pods and g is recessive for yellow pods, what percentage of the offspring will have green pods? _______% . 75.

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slide2

G g

The parents in this cross are _____________

Homozygous Heterozygous

Heterozygous

G

g

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

75

slide3

The genotype of the offspring in the blue box is _______

bb

The offspring in the blue box is

homozygous heterozygous

homozygous

slide4

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 = Bb

Pure brown = bb

homozygous

Another name for pure is _________________

slide5

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

The following statements are TRUE or FALSE?

F A & B are codominant

A is dominant over B.

O is dominant over A.

A is dominant over O.

B and A are co-dominant

A is incompletely dominant over O.

O is recessive to A and to B

F O is recessive to both A & B

T

T

F

T

slide6

X y

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?

Father ;

The mother always gives an X

If the father gives a y, it’s a boy.

If the father gives an X; it’s a girl.

slide7
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

slide8

R r

  • r
  • r

Red throats (R) are dominant over white (r)

throats in Goonie birds.

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

Rr rr

Rr rr

What are the possible phenotypes of their offspring?

(% and color)

50% red throats

50% white throats

slide9

B b

B

b

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

Make a cross between two HETEROZYGOUS rats.

BB Bb

Bb bb

What are the possible phenotypes of their offspring?

(% and color)

75 % black eyes

25% red eyes

slide10

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

slide11

Gregor Mendel

Who is the “Father of Genetics”?

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

TT Rr Ww bb XX Ss

RrWwSs

slide12

What kind of cross is this?

Pure dominant X pure recessive

Heterozygous X heterozygous

Heterozygous X homozygous

Hybrid recessive X hybrid pure

Heterozygous X Homozygous

hybrid

Another name for heterozygous is _______________

slide13

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

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

T T

t

t

Tt Tt

Tt Tt

What is the probability the offspring will have straight tails?

0%

All will be Curly tailed (Tt)

slide14

What type of gametes can this organism produce?

BbTt

______ ______ _______ _______

BT bt bT Bt

What type of gametes can this organism produce?

BBTT

______ ______ _______ _______

BT BT BT BT

slide15

TtRr X TtRr

TTRR TTRr TtRR TtRr

TTRr TTrr TtRr Ttrr

TtRR TtRr ttRR ttRr

TtRr Ttrr ttRr ttrr

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

seeds seeds

slide16

9:3:3:1

This is an example of a DIHYBRID cross.

Which pattern of phenotypes will be seen in the offspring?

How many offspring will be

Short AND Round? ______

Short AND wrinkled? ______

3/16

Recessive and dominant

1/16

Recessive and recessive

HINT:9- dominant for both3- recessive and dominant

3- dominant and recessive

1- recessive and recessive

slide17

F2

What do we call the offspring of the F1 generation?

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

TT bb Rr Ww tt XX aa

bb tt aa

slide18

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

slide19

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

slide20

T

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

F

T

Tt and TT both look tall

slide21

Dominant/recessive

Incomplete dominance

Co-dominance

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

Offspring of the P1 generation are called

______

F1

slide22

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

A B

O

O

Ao Bo

Ao Bo

What are the probable blood types of the offspring?

50% Type A

50% Type B

slide23
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 SsYy

9:3:3:1 ratio is seen in dihybrid crosses

slide24

Purple (P)is the dominant color for monsters. Yellow is recessive (p).

Make a cross between a HOMOZYGOUS purple and a yellow monster.

P P

p

p

Pp Pp

Pp Pp

What will the offspring be like?

(% and color)

100% purple

slide25
What genotype would a PURPLE dad have to be to make a yellow monster baby with a Purple (Pp) mom monster?

pp

Pp

Dad needs to have: a little p to give one to the baby

a big P to be purple himself

slide26

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?

A A

o

o

Ao Ao

Ao Ao

100% will have A type blood

slide27

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?

A A

o

o

Ao Ao

Ao Ao

100% will have A type blood

slide28

What type of gametes can this organism produce?

RrTt

______ ______ _______ _______

RT rt rT Rt

What type of gametes can this organism produce?

WwGg

______ ______ _______ _______

WG wg wG Wg

slide29

FILL IN THE BLANKS WITH THE WORDS

Dominant OR Recessive

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

Dominant

Recessive

Recessive

slide30

T = Tall R = red

t = short r = white

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

3

9

1

slide31

T = Tall Y = yellow peas

t = short y = green peas

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

3

3

9

slide32

Y = yellow peas R = red flowers

y = green peas r = white flowers

In this cross: YYRR X yyRR

Be 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

0

16

0

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