Coconote
AI notes
AI voice & video notes
Export note
Try for free
Monogenetic Inheritance
May 15, 2024
🤓
Take quiz
Monogenetic Inheritance
Overview
Focus on
Specification Point B
from Patterns of Inheritance
Today's focus:
Monogenetic Inheritance
Mono
means one; refers to the inheritance of one particular gene
Example: Pea Plants
Parental Phenotypes
: Round and Wrinkled
Genotypes
:
Homozygous dominant (Round):
RR
Homozygous recessive (Wrinkled):
rr
Gametes
:
Round plant produces only
R
Wrinkled plant produces only
r
F1 Generation
:
Genotype: All offspring
Rr
Phenotype: All offspring are Round (due to dominant
R
)
Punnett Square
To show genotypic outcomes and get exam marks
F1 Cross
:
Rr
x
Rr
Possible combinations:
RR
- Round
Rr
- Round
Rr
- Round
rr
- Wrinkled
F2 Generation
Parental Genotypes
: Both
Rr
Gametes
: Each produces
R
and
r
Offspring Phenotypes
:
3 Round : 1 Wrinkled
Phenotypic Ratio
: 3:1
Genotypic Ratio
: 1
RR
: 2
Rr
: 1
rr
(1:2:1 ratio, often not asked in exams)
Important Exam Tips
Be descriptive: Always specify what the numbers in your ratios represent.
Include all elements (genotype, gametes, Punnett square) even if the final ratio is incorrect.
Focus more on the
phenotypic ratio
for exam purposes.
Summary
Monogenetic Inheritance
: Inheritance of a single gene
In next sessions:
Dihybrid Inheritance
(two genes)
Keep practicing Punnett squares for accurate representation and full marks.
📄
Full transcript