Home > Punnett Square Practice Chapter 9

Punnett Square Practice Chapter 9


 
 

GENETICS Practice 
Chapter 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   g  

G

g


 
 





The genotype of the offspring in the blue box is _______

  

bb 

The offspring in the blue box is

       homozygous               heterozygous 

homozygous


 
 





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 













Another name for pure is _________________ 

homozygous


 
 

Bo 

AB 


Ao 

AA 




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-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


 
 

    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 X

If 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

 


 
 

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 recessive

Heterozygous X heterozygous

Heterozygous X homozygous

Hybrid 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 type of gametes can this organism produce? 

                           BbTt 

______       ______       _______    _______ 

What type of gametes can this organism produce? 

                           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?  ______ 

3/16 

Recessive and dominant 

Recessive and recessive 

HINT: 
9- dominant for both 
3- recessive and dominant

3- dominant and recessive

1- 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         


 
 





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


 
 

gg 


Gg 

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/recessive

Incomplete dominance

Co-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 SsYy

9:3:3:1 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


 
 

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


 
 

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


 
 

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


 
 

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 

Dominant

Recessive           

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 = red

t = short   r = white 

3          

9 

1


 
 

            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 peas

t = short   y = green peas 

3          

3 

9


 
 

            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 

Y = yellow peas   R = red flowers

y = green peas   r = white flowers 

0          

16 

0


Search more related documents:Punnett Square Practice Chapter 9

Set Home | Add to Favorites

All Rights Reserved Powered by Free Document Search and Download

Copyright © 2011
This site does not host pdf,doc,ppt,xls,rtf,txt files all document are the property of their respective owners. complaint#nuokui.com
TOP