MENDELIAN GENETICS

2. 1.Avoid unnecessary noise
2.Avoid always going in and out during
class discussion
3.Participate during the group activity and
in every activity
4.Raise your hand if you want to recite
5.Be time conscious

3. Decode the terms by writing the letter that comes
after each letter on the boxes below. The
definition that follows might be a great help.
Underlined letters need not be replaced.
EXAMPLE
GDQDDHSX Passing of trait
HE RE DIT Y
FDMD Basic unit
of inheritance
GENE

4. An observable characteristics of an
individual
SQAHS
T R A I T

5. Basic unit of inheritance
FDMD
GE N E

6. An allele that masks the expression of its
partner on the homologous
chromosome
D O MI N A N T
CNLHMAMS

7. An allele whose expression is masked by
the expression of its partner on the
homologous chromosome
R E C E S S I V
QDBDRRHUD
E

8. A description of an individual’s genetic
make-up that specifies which alleles are
present
G E NO T Y P
FDLNSXOD
E

9. A description of an individual in terms of its
observable traits
P H E NOT Y
OGDMNSXOD
PE

10. A sexual reproductive cell that contains half
a set of chromosomes, one of each
homologous pair
GAME T E
FALDSD

11. PREDICT PHENOTYPE AND
GENOTYPE IN A MONOHYBRID
CROSS USING A PUNNETT SQUARE

12. Using a popsicle stick as a chromosome
make a cross between parents to predict
the possible gametes and offspring

13. 1. Place two red- spotted popsicle sticks in each of the
parent boxes
2. Add a single red-spotted popsicle sticks to each of the
gamete boxes
3. Add two red-spotted popsicle sticks to each of the
offspring boxes as they show all possible combinations of
gametes.Write your observation.
4. Repeat the process with both parents having two alleles
for white flowers.
5. Cross a true-breeding plant with white flowers (2 white
popsicle sticks) with a true-breeding plant with red
flowers (2 red popsicle sticks)

14. 1. What do the popsicle sticks represents?
 PARENTS CHROMOSOMES
2. What are the genotypes and phenotypes of the parents?
 RED/WHITE
3. What are the genotypes of the offsprings?
 ALL ARE RED/ WHITE
4. What flower color would the offspring have and why?
 All red/all white. It is a cross of pure or homozygous red or white
5. How will you get the number of possible offspring?

15. FEMALE GAMETES
MALE
GAMETES
R R
R
R
RR RR
RR RR
Genotype: RR
Phenotype: all RED
Genotypic ratio:
4:4 or 100%
Phenotypic ratio:
4:4 or 100%

16. a. Use Punnet Squares for monohybrid
crosses
b. Determine the phenotype and genotype
c. Predict the phenotypic and genotypic
ratios for monohybrid crosses based on the
Punnet Square

17. Red beans
White beans
2 small paper bags (one labelled
male and the other labelled
female

18. 1.One student in the group will be in charge of the
male bag and the other student will be in charge of
the female bag.
2.At the same time, each student will reach into their
bag and pull out one of the beans
3.Mark the resulting genotype and phenotype in the
data table.
4.Return the beans back into the bag and conduct
the same process 14 more times (15 total trials).

19. Trial Offspring’s Genotype Offspring’s Phenotype
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15

20. 1.What is the dominant trait?
ans:red beans
2.How do you know it is dominant?
ans: because the allele of a gene that masks or supresses the
expression of an alternate allele (begins with capital letter)
3.Which one is the recessive trait?
Ans: white beans
4.What are the genotypes of the parents?
ans: Rr
5.What are the phenotypes of the parents?
Ans: Heterozygous red

21. Male Rr x Female Rr
Rr X Rr
R r R r
RR rr
R R
r
r
Rr Rr
Rr Rr
7.What is the genotypic ratio?
ans.100 %Rr
8.What is the phenotypic ratio?
ans: 100 % hybrid round

22. Pod color: A heterozygous yellow (Gg) is crossed with another
heterozygous yellow ( Gg)
G g
G
g
GG Gg
Gg gg
What is the genotypic ratio?
ans.1: 2 : 1 or 25 % GG, 50 % Gg, 25 % gg
What is the phenotypic ratio?
ans: 3: 1
Genotype: GG,Gg,gg
Phenotype: Yellow,
green

23. Solve the given monohybrid problems using a punnett
square
1. A Aa plant is crossed with a Aa plant. What is the genotypic
and phenotypic ratio of the offsprings? What percentage of
the offspring will be short?
2. Brown eyes in humans are dominant to blue eyes. A brown-
eyed man, whose mother was blue-eyed marries a brown-eyed
woman. What is the probability that this couple will have a
blue-eyed child?

25. PLANT AND ANIMAL BREEDING
Creation of new breed of plants and animals

27. 1. Bb x Bb. Determine the phenotype and genotype
using the punnett square.
2. One cat carries heterozygous, long-haired traits
(Ss), and its mate carries homozygous short-haired
traits (ss). Use a Punnett square to determine the
probability of their offspring having long hair and the
probability of their offspring having short hair