Inheritance and Variation — BIOLOGY STD 12 Science — Question
Maharashtra BoardEnglish MediumSTD 12 ScienceBIOLOGYInheritance and Variation3 Marks
Question
Write the statements of three laws of inheritance given by Mendel.
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Answer
$(1)$ Statement of Law of Dominance : When two homozygous individuals with one or more sets of contrasting characters are crossed, the alleles that appear in $F_1$ are dominant and those which do not appear in $F_1$ are recessive.
$(2)$ Statement of Law of Segregation or Law of purity of gametes : When $F_1$ hybrid forms gametes, the alleles segregate from each other and enter in different gametes. The gametes formed are pure because they carry only one either dominant allele or recessive allele each. Due to this the law is also called “Law of purity of gametes”.
$(3)$ Statement of Law of Independent Assortment : When hybrid possessing two $($or more$)$ pairs of contrasting alleles forms gametes, these alleles in each pair segregate independently of the other pair.
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