Short Answer TypeWhat is a test cross? How can it decipher the heterozygosity of a plant?
Test cross is a cross between an organism with unknown genotype and recessive parent
It is used to determine whether the Individual is homozygous or hetrozygous for a trait If the progeny produced by a test cross show 50% dominant trait and 50% recessive trait then unknown individual is hetrozygous for a trait on other hand if the progeny produced shows dominant trait then the unknown individual is homozygous for trait.
Long Answer Type(a) What is polygenic inheritance ? Explain with the help of a suitable example.
(b) How are pleiotropy and Mendelian pattern of inheritance different from polygenic pattern of inheritance ?
Short Answer TypeGive an example of an autosomal recessive trait in humans. Explain its pattern of inheritance with the help of a cross.
Long Answer TypeA. Why is haemophilia generally observed in human males? Explain the conditions under which a human female can be haemophilic.
B. A pregnant human female was advised to undergo M.T.P. It was diagnosed by her doctor that the foetus she is carrying has developed from a zygote formed by an XX egg fertilized by Y-carrying sperm. Why was she advised to undergo M.T.P.?
Short Answer TypeDuring a medical investigation, an infant was found to possess an extra chromosome 21. Decribe the symptoms the child is likely to develop later in the life.
Long Answer TypeState and explain the ‘law of independent assortment’ in a typical Mendelian dihybrid cross.
Short Answer TypeGive a scientific term:
Exhibition of superiorityof the hybrid over both of its parents
Switch
