8/19/2019 Worksheet on Mendelian Patterns of Inheritance

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Name : Xuanye Li 10C Mark: ________

MENDELIAN PATTERNS OF INHERITANCE

 A. Identify the following as genotype or gamete. If it is a genotype, write all possible gametes thatcan be formed.

Gamete 1. BbGamete 2. GhGamete 3. EeGenotype 4. CCDd CD, CdGamete 5. ABcdGenotype 6. HhRr HR, Hr, hR, hr

B. Write the following in symbols, given the assigned letter for the alleles.R- round seed Y- yellow seed A- axial position I- inflated podr- wrinkled seed y- green seed a- terminal position i- constricted pod

RR 1. Homozygous round rr 5. Wrinkled seed Yy 2. Heterozygous yellow II 6. Homozygous inflated Aa 3. Heterozygous axial AA 7. Homozygous axialii 4. Constricted pod yy 8. Green seed

C. COUNTING # OF GAMETES. How many possible gametes can be formed by the followinggenotypes?

2 1. Aa 4 6. AaBb1 2. AA 1 7. aabbcc1 3. aa 8 8. AaBbCc1 4. AABB 8 9. aabbCcDdEegg

1 5. aabb 1 10. RRssTTuuVV

D. Problem Solving. Solve the following completely. Show your Punnett square.

1. In humans, right-handedness (R) is dominant toleft-handedness (r). If a heterozygous right-handed man marries a left-handed woman, whatwill be the possible:

a. genotype of the offspring?

Rr or rr

b. phenotype of the offspring?

Right Handed or Left Handed

c. probability of producing left-handed child?

1/2

2. Widow’s peak (H) is dominant to straight hairline

(h). A couple both heterozygous for the traitdecided to marry. What will be the possible:

a. F1 genotype?

HH, Hh or hh

b. F1 phenotype?

Widow's peak or straight hairline

c. F1 phenotypic ratio?

3:1

8/19/2019 Worksheet on Mendelian Patterns of Inheritance

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3. If you cross a heterozygous tall pea plant with ahomozygous tall pea plant, what is the probabilityof having:

a. tall plants? 1

b. short plants? 0

c. pure tall plants? 1/2

d. hybrid tall plants? 1/2

4. A pea plant with heterozygous round seeds iscrossed with a plant which has wrinkled seeds.What are the chances of having:

a. wrinkled-seeded plants? 1/2

b. round-seeded plants? 1/2

5. The presence of dimple (D) in humans is adominant trait. A homozygous dimpled man and a

non-dimpled woman have 4 children. What arethe possible F1 

a. genotypes? Dd

b. phenotypes? Dimpled

* If they decided to have a 5th  child, predict thechild’sc. genotype Dd

d. phenotype Dimpled

8/19/2019 Worksheet on Mendelian Patterns of Inheritance

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PUNNETT SQUARES - DIHYBRID CROSSES

In a dihybrid cross, when two traits are considered, the number of possible combinations in the offspringincreases. Suppose that black hair (B) is dominant over blonde hair (b) and brown eyes (E) are dominantover blue eyes (e).

1. The father has black hair (heterozygous) and brown eyes (heterozygous) and the mother has blonde hairand blue eyes.

Genotype of the father – BbEe

Genotype of the mother - bbee

In the Punnett square below, complete the remaining gametes of the father. Then, fill in the boxes below.

a. What percent of offspring have blonde hair and blue eyes? 25%

2. Both parents are hybrid black-haired and hybrid brown-eyed.

Genotype of the father - BbEe

Genotype of the mother - BbEe

Complete the Punnett square below:

a. What percent of offspring have blonde hair and blue eyes? 6.25%

b. Give the phenotypic ratio of the offspring with (1) black hair and brown eyes; (2) black hair and blueeyes; (3) blonde hair and brown eyes; and (4) blonde hair and blue eyes.

9:16, 3:16, 3:16, 1:16

BE BebE be

 

be

BbEe Bbee bbEe bbee

 

be

BbEe Bbee bbEe bbee

beBbEe Bbee

bbEebbee

beBbEe Bbee bbEe bbee

BE

Be

bE be

 

BE

BBEE BBEe BbEE BbEe

 

Be

BBEe BBee BbEe Bbee

bE

BbEE BbEe

bbEE

bbEe

beBbEe Bbee bbEe bbee