To study the prepared pedigree charts of genetic traits MH board class 12th biology practical 10

10. To study the prepared pedigree charts of genetic traits such as rolling of tongue, widow's peak, blood groups and colour blindness

To study the prepared pedigree charts of genetic traits MH board class 12th biology practical 10

MH board class 12th biology practical 10

"Decoding Heredity 🧬 | Pedigree Charts of Genetic Traits | Class 12 Biology Practical"

Genetics is the blueprint of life! This experiment delves into pedigree charts to understand how traits like tongue rolling, widow's peak, blood groups, and color blindness are inherited across generations. Pedigree charts help visualize the passage of these traits, revealing the mysteries of dominant, recessive, and sex-linked inheritance.

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🔬 Aim

To study prepared pedigree charts of genetic traits such as tongue rolling, widow's peak, blood groups, and color blindness and analyze their inheritance patterns.

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🧪 Materials Required

Pre-prepared pedigree charts for:

1. Tongue Rolling

2. Widow's Peak

3. Blood Groups

4. Color Blindness

Notebook and pencil

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🌱 Procedure

1️⃣ Analyze the Pedigree Charts:

Study the symbols:

Square (♂): Male

Circle (♀): Female

Shaded Symbols: Individuals expressing the trait

Unshaded Symbols: Individuals without the trait

Horizontal Line: Mating

Vertical Line: Offspring

Observe how traits are passed across generations.

2️⃣ Identify the Inheritance Pattern for Each Trait:

Tongue Rolling (Dominant Trait):

Look for individuals with the ability to roll their tongue.

The trait appears in every generation if at least one parent has the dominant allele (R).

Widow's Peak (Dominant Trait):

Observe individuals with the characteristic hairline.

The trait is inherited if one parent carries the dominant allele (W).

Blood Groups (Co-dominance):

Study how blood groups (A, B, AB, O) are inherited based on the alleles (IA, IB, i).

Co-dominance occurs when both IA and IB are expressed (AB blood group).

Color Blindness (X-linked Recessive):

Note how males and females are affected differently.

Males are more frequently affected due to having only one X chromosome (XcY).

3️⃣ Record Your Observations:

Draw diagrams for each pedigree chart.

Label generations (P, F1, F2) and individuals clearly.

Identify carriers, affected individuals, and inheritance patterns.

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🌟 Observations

Inheritance Patterns of Genetic Traits:

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Key Results

1. Dominant traits like tongue rolling and widow's peak are passed on when at least one parent carries the dominant allele.

2. Blood groups show co-dominance, with both IA and IB expressed together in AB individuals.

3. Color blindness is a sex-linked recessive trait, predominantly affecting males.

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🤔 Why Does This Happen?

Genes are passed from parents to offspring through dominant, recessive, or sex-linked inheritance.

Traits like tongue rolling and widow's peak are governed by dominant alleles, while traits like color blindness depend on the X chromosome.

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Precautions for Accurate Analysis:

✅ Carefully observe and interpret the symbols in the pedigree chart.
✅ Label all generations and individuals clearly for proper identification.
✅ Confirm the inheritance pattern with multiple examples for better understanding.

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💡 Importance of the Experiment

✔️ Explains how genetic traits are passed across generations.
✔️ Highlights differences between dominant, recessive, and sex-linked inheritance.
✔️ Helps understand genetic disorders and carrier status in populations.

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🔥 Share Your Learning!

Draw and share your labeled pedigree charts for each genetic trait. Discuss the inheritance patterns with your peers and relate them to real-life genetic examples in families.

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Hashtags to Trend

#GeneticsDecoded 🧬 #PedigreeChartStudy 🔬 #Class12Biology #MHBoardBiology 🌱 #ScienceOfHeredity 👨‍👩‍👧‍👦 #LearnBiology #InheritancePatterns #GeneticTraits