InterviewSolution
Saved Bookmarks
InterviewSolution
| 1. |
Question : Describe one gene inheritance. |
|
Answer» Solution :The study of inheritance of a single pair of alleles or factors of a trait at a time (monohybrid cross) is called one gene inheritance. = Based on his observations on monohybrid crosses, Mendel proposed two general rules in order to consolidate his understanding of inheritance in monohybrid crosses. = These rules are called the principles or laws of inheritance. = They are : =Law of Dominance (First Law) : (i) Characters are controlled by discrete units called FACTOR. (ii) Factors occur in pairs. (iii) In a DISSIMILAR pair of factors, one member of the pair is dominant while the other is recessive. = This law is used to explain the expression of only one of the parental characters in a monohybrid cross in the `F_1` generation and the expression of both in the `F_2` generation. It ALSO explains the proportion of 3 : 1 ratio obtained in the `F_2` generation. =Law of Segregation (Second Law) :This law STATES that though the parents contain two alleles during gamete formation the factors or alleles of a pair SEGREGATE from each other, such that gamete receives only one of the two factors. = Hence, the alleles do not show any blending and both the characters are recovered as such in the `F_2` generation, though one of these is not seen in the `F_1` generation |
|