Homework Answers
Ans) The correct options are a,c,d
Genetic variation is increased by crossing over,independent assortment of homologous chromosomes during meiosis, alleles are inherited by two parents instead of one.
Option "b" is incorrect because in binary fission,genetically identical offspring is produced so there is no chance of genetic diversity. Moreover,binary fission is asexual reproduction and not sexual reproduction.
Option "e" is incorrect. Pairing of homologous chromosomes results in exchange of non-sister chromatids during crossing over and not sister chromatids.
Ans) The correct option is "e".
Crossing over of homologous chromosomes occurs in Prophase-I of meiosis. This eliminates the rest of the options.
Ans) The correct option is "b" .
Let the two alleles that show complete dominance be AA. When heterozygotes are crossed i.e Aa x Aa , we will get 25% AA , 50%Aa , 25% aa .
Now when again the 2 homozygous recessive individuals breed i.e aa x aa , we will obtain 100% aa
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