Review. Meiosis Draw a cell in interphase before and after replication with a diploid number 4. replication What would the haploid number of gametes be?

Review

Meiosis Draw a cell in interphase before and after replication with a diploid number 4.

replication

What would the haploid number of gametes be?

Anaphase I Metaphase I Prophase II

End of Telophase IIProphase IAnaphase II

x

Haploid or Diploid

Haploid

Haploid

Haploid Diploid

Diploid Diploid

An aquatic arthropod called Cyclops has antennae that are either smooth (a) or barbed(A). The allele for barbs is dominant. In the same organism, long (T) tails are dominant to short (t) tails.

Question: A Cyclops that has a short tail and smooth antennae is crossed with one that is heterozygous for both traits.

Genotype Ratio ______________________________Phenotype Ratio ______________________________

Genotype Ratio:

1: AaTt: 1 Aatt: 1 aaTt : 1 aatt

Phenotype Ratio : 1 Barbed, Long tail : 1 Barbed, short tail: 1 smooth, long tail: 1 smooth, short tail

A curly haired person and a straight haired person mate and all their offspring have wavy hair (note that wavy hair is a phenotype an intermediate that of the curly and straight haired individuals).

Genotype Ratio: __________?____________

Phenotype Ratio: __________?____________

Genotype Ratio (letters)1 CC : 2 CS : 1

SS

Phenotype Ratio ( physical appearance)1 Curly: 2 wavy : 1 straight

X-linked recessiveA : normal a: trait present Genotype? # 2,3,5,7

X-linked recessiveA : normal a: trait present

#5 XAXa

#3 XAY

# 7 XAX?

#2 XAXa

Who is the “Father of Genetics”?

Gregor Mendel

When 2 alleles DON’T BLENDbut BOTH SHOW TOGETHERlike in A B blood type, it is called_______________

Codominance incomplete dominance

codominance

Transmission of characteristics from parents to offspring is called ___________________.

_____________ is the study of how characteristics are passed on from one generation to the next.

heredity

Genetics

__________________ = An allelethat IS MASKED BY the

presence of another allele

RECESSIVE

The appearance of an organism is

its _____________phenotype

Another name for heterozygous

hybrid

The diagram at the rightis called a _____________Punnett square

__________________ = An allele that MASKS the presence of another allele

Red and white flowers producingpink offspring is an example of

_______________________ Codominance incomplete dominance

DOMINANT

Incomplete dominance

A recessive gene is represented by a _________________ letter.lower case

What phenotypic ratio would youexpect to see in offspring from amonohybrid cross of 2 heterozygous parents?

3:1 Dominant:recessive

_______________

are different gene

choices for a trait.

ALLELES

A dominant gene is represented by a ____________ letter.(usually the first letter of the trait)

capital

When a heterozygous individual showsa blending of 2 alleles instead of one being dominant over the other it is called___________ ____________.Incomplete dominance

When both alleles in the pair are the SAME the organism is _______________ or __________

9:3:3:1

HOMOZYGOUS PURE

What phenotype ratio is a cluethat there has been a dihybrid crossbetween 2 heterozygous parents?

R = red flowers r = white flowers

Red

pink

An Rr organism would have ____________ flowers if this trait was COMPLETELY DOMINANT.

An Rr organism would have ____________ flowers if this trait was INCOMPLETELY DOMINANT.

An Rr organism would have ______________ flowers if this trait was CODOMINANT.

BOTH red & white

What are Mendel’s 2 laws of heredity?

Law of SegregationLaw of Independent Assortment

F1

The offspring of the P1 generationare called the ____ generation

When both alleles in the pair are DIFFERENT the organism is

_________________ or _____________HETEROZYGOUS HYBRID

monohyridA cross that involves only 1 traitis called a ____________ cross.

T = Tall

t = short

The genotype of the offspring from the

cross at the right is _________.

Their phenotype is _________.

Tttall

Which of the following genotypesis homozygous?

TT Ww Bb rr mm BB Tt

TT rr mm BB

pureAnother name for homozygous is________.

Which of these Punnett squares would you

use to predict the offspring of a DIHYBRID cross?

This one!

In the cross at the

right __________

is dominant for flower color.

red

Tt Mm Rr

Which of the following genotypesis from a heterozygous organism?

Tt SS bb Mm Rr kk

A gene is a segment of _______that codes for a trait.

DNA

meiosis

The Law of Segregation and theLaw of Independent Assortmentare the result of the movement ofchromosomes during ___________

mitosis meiosis

The Punnett square below shows a ___________ cross.

homozygous monohybrid dihybrid testdihybrid

Crossing a red haired horse with a white haired horse produces a roan colored horse.

(Both alleles for hair color show together). This kind of inheritance is called ___________________Co-dominance

What type of genotype is used to make a test cross?

Homozygous recessive

BT bt bT Bt

What type of gametes can this organism produce?

BbTt

______ ______ _______ _______

In guinea pigs, black fur (B) is dominant over brown fur (b).

If a black Guinea pig is crossed witha brownGuinea pig and the littercontains a brown baby, the genotypeof the black parent is probably

BB Bb bb

Bb; Must have one B to be black must have one b to pass on to baby

Which of these Punnett squares would you

use to predict the offspring of a MONOHYBRID cross?

This one!

Crossing individuals from the P1 generation produces the

____ generation.F1

DNAA gene is a segment of ______.

DNA PROTEIN RNA CARBOHYDRATE

L = Blue legs l = yellow legs

Blue

green

An Rr organism would have ____________ legs if this trait was COMPLETELY DOMINANT.

An Rr organism would have ____________ legs if this trait was INCOMPLETELY DOMINANT.

An Rr organism would have ______________ legs if this trait was CODOMINANT.

BOTH Blue & yellow

In a monohybrid cross of twoHETEROZYGOUS parents (Pp), you would

expect the offspring to be:

1 pp:3 PP 3 Pp:1 pp

1 PP:2 Pp:1 pp

1 PP:2 Pp:1 pp all Pp

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

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

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.

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

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


BbTt

______ ______ _______ _______


BBTT

______ ______ _______ _______BT BT BT BT

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

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 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

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 are the 3 different kinds of inheritance you learned about?

Dominant/recessiveIncomplete dominanceCo-dominance

Offspring of the P1 generation are called ______

F1

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

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 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

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


RrTt

______ ______ _______ _______


WwGg

______ ______ _______ _______WG wg wG Wg

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

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

In this cross: TtYy X TtYy


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!


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

Review. Meiosis Draw a cell in interphase before and after replication with a diploid number 4. replication What would the haploid number of gametes be?

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