biology-class-12-unit-05-chapter-02-genetics-evolution-principles-of-inheritancevariation-l-2-7-59ahrw0cnbo

### <Success style="font-size:25px"> Genetics Evolution Principles Of Inheritancevariation L-2 </Success>
### <primary style="font-size:24px"> Reasons for Mendel's success </primary>
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- Selection of garden pea as experimental material
- Selection of true breeding plants
- He studied the inheritance of a single character at a time
- He kept the accurate record of his breeding experiments
- Analyzed the result in a statistical methods and law of probability

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<footer style = "font-size: 18px">Test cross $\rightarrow$ Back cross $\rightarrow$ <span style = "color:blue"> Reasons for Mendel's success </span> $\rightarrow$ Reciprocal cross $\rightarrow$ Mendelian laws </footer>

### <Success style="font-size:25px"> Genetics Evolution Principles Of Inheritancevariation L-2 </Success>
### <primary style="font-size:24px"> Mendelian laws </primary>
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- Law of Unit Characters - It states that each hereditary character is controlled by a pair of factors
- Example - purple flower colour - PP, Pp

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<footer style = "font-size: 18px">Reasons for Mendel's success $\rightarrow$ Reciprocal cross $\rightarrow$ <span style = "color:blue"> Mendelian laws </span> $\rightarrow$ Law of dominance $\rightarrow$ Law of independent assortment </footer>

### <Success style="font-size:25px"> Genetics Evolution Principles Of Inheritancevariation L-2 </Success>
### <primary style="font-size:24px"> Law of dominance </primary>
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- It states that in a dissimilar pair of factors present in a hybrid individual, one member of the pair expresses the character and the other one gets suppressed
- Expressed one is called dominant and suppressed one is called recessive
- Example - Pp - Pallele produces purple character

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<footer style = "font-size: 18px">Reciprocal cross $\rightarrow$ Mendelian laws $\rightarrow$ <span style = "color:blue"> Law of dominance </span> $\rightarrow$ Law of independent assortment $\rightarrow$ Review questions </footer>

### <Success style="font-size:25px"> Genetics Evolution Principles Of Inheritancevariation L-2 </Success>
### <primary style="font-size:24px"> NCERT Questions </primary>
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- **Question 3.** A diploid organism is heterozygous for 4 loci, how many types of gametes can be formed?

- **Answer.** Heterozygous for one locus, it produces two types of gametes . It can be calculated by using the formula 2 n

- Here n denotes number of loci or number of contrasting characters. Since it is 4 loci, it is 24 = 2x2x2x2 = 16 types of gametes

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<footer style = "font-size: 18px">Monohybrid cross $\rightarrow$ NCERT Questions $\rightarrow$ <span style = "color:blue"> NCERT Questions </span> $\rightarrow$ Think it over $\rightarrow$ Thank you </footer>

### <Success style="font-size:25px"> Genetics Evolution Principles Of Inheritancevariation L-2 </Success>
### <primary style="font-size:24px"> Think it over </primary>
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- **Question.** A pea plant producing axial flower is crossed with another pea plant producing terminal flower. Among the progenies, 45 plants are producing axial flower, whereas 48 plants are producing terminal flower

- **Question.** What is the type of inheritance noticed here?

- **Question.** Write the genotype of the parents and work out in a Punnett's Square

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<footer style = "font-size: 18px">NCERT Questions $\rightarrow$ NCERT Questions $\rightarrow$ <span style = "color:blue"> Think it over </span> $\rightarrow$ Thank you $\rightarrow$  </footer>