4.Principles of Inheritance and Variation
medium

નીચેની નિશાનીઓમાંથી કઈ નિશાની અને તેની રજૂઆત માણસના વંશાવળીના નકશા બનાવવા માટે વપરાય છે તે સાચી છે ?

A

 નજીકના સંબંધીઓ વચ્ચે પ્રજનન

B

અસર ન થઈ હોય તેવો પુરુષ

C

અસર ન થઈ હોય તેવી સ્ત્રી

D

અસર પામેલ નર

(AIPMT-2010)

Solution

(a): A record of inheritance of certain genetic traits for two or more generations presented in the form of a diagram or family tree is called pedigree. In a pedigree a square represents the male, a circle the female, solid (blackened) symbol shows the trait under study or affected individual; unaffected or normal individual by an open or clear symbol and a cross or shade (of any type) in the symbol signifies the carrier of a recessive allele. Words can also be used in place of symbols. Parents are shown by horizontal line while their offsprings are connected to it by a vertical line. The offsprings are then shown in the form of a horizontal line below the parents and numbered with arabic numerals.

Standard 12
Biology

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