Punnett Square Practice Chapter 9 - local.brookings.k12.sd.us
GENETICS Practice Chapter 11 G g G GG Gg g Gg gg The parents in this cross Heterozygous are _____________ Homozygous 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
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 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 B B B b
B b B b B b b B b b b B This is the
Correct setup Heterozygous = Bb Pure brown = bb homozygous Another name for pure is _________________ A o A B AA Ao The alleles for blood type show 2 kinds of inheritance.. AB Bo The following statements are TRUE or FALSE?
F F T T F T A is dominant over B. A & B are codominant O is dominant over A. O is recessive to both A & B 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 An organism has the genotype Xy. What are the possible sperm it can produce? ______ ______ X y 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, its a boy. If the father gives an X; its a girl. If you cross a homozygous RED flowered four oclock 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 R r
r Rr Rr r Red throats (R) are dominant over white (r) throats in Goonie birds. rr rr What are the possible phenotypes of their offspring? (% and color) Make a cross between a PURE RECESSIVE and a HETEROZYGOUS
Goonie bird. 50% red throats 50% white throats B b B BB Bb b Bb bb 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 The parents in this cross Homozygous are _____________ Homozygous Heterozygous 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 Rr Ww bb
XX Ss 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 hybrid Another name for heterozygous is _______________ t t T T
Tt Tt Tt Tt In Reebops curly tails (T) are dominant over straight tails (t). Make a cross between a HOMOZYGOUS DOMINANT and a HOMOZYGOUS RECESSIVE Reebop. What is the probability the offspring 0% will have straight tails?
All will be Curly tailed (Tt) What type of gametes can this organism produce? BbTt BT ______ bt ______ bT Bt _______ _______ What type of gametes can this organism produce? BBTT BT ______ BT
TtRr Ttrr ttRr ttrr TR Tr Tall = T short = t R= round seeds r=wrinkled seeds 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 3/16 Short AND Round? ______ Recessive and dominant 1/16 Short AND wrinkled? ______ Recessive and recessive HINT: 9- dominant for both 3- recessive and dominant 3- dominant and recessive 1- recessive and recessive 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 bb Rr Ww tt tt XX aa 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? (75%) AA and Aa G g G g
G is dominant for green pods. g is recessive for yellow pods. GG Gg gg What is the genotype of the offspring in the shaded box? What is the phenotype of the offspring in the shaded box? Gg 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 ______ A O
O B Ao Bo Ao Bo 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 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 P p p P Pp Pp Pp
Pp 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 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 A o o Ao Ao A Ao Ao
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 A o o Ao Ao A Ao Ao 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 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 _______ FILL IN THE BLANKS WITH THE WORDS Dominant OR Recessive In a DIHYBRID HETEROZYGOUS cross the offspring that are Dominant 9/16 are _______________ for both traits. Dominant for one trait and 3/16 are _____________ Recessive for the other.
_____________ Recessive for both traits. 1/16 are _____________ T = Tall t = short R = red r = white In this cross: TtRr X TtRt What is the probability the offspring will be: Tall AND white? ____/16 3 Short AND red? ____/16 3 Tall AND red? ___/16
9 Short AND white? ___/16 1 T = Tall t = short Y = yellow peas y = green peas In this cross: TtYy X TtYy What is the probability the offspring will be: short AND green? ____/16 1
Short AND yellow? ____/16 3 Tall AND green? ___/16 3 tall AND yellow? ___/16 9 Y = yellow peas y = green peas In this cross: Be careful! R = red flowers r = white flowers YYRR X yyRR What is the probability the offspring will be:
Yellow peas AND white flowers? ____/16 0 Green peas AND red flowers? ____/16 0 Yellow peas AND red flowers? ___/16 16 Green peas AND white flowers? ___/16 0
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