KCET 2019 Previous Year Question Paper for Biology

KCET Biology 

Biology Answer Key 2019 Is Provided Below.

Q1. Determine the Percentage of White-Eyed Miniature Winged Recombinants In F2​ Generation in Morgan's Experiments on the Linkage.

(A) 98.7%

(B) 37.2%

(C) 1.3%

(D) 62.9%

Ans: (B)

Multiple tests were conducted by Morgan and his students and they have found that linked genes display varied recombination. Also, some of them are more tightly linked than others.

(i) They have done some crossings between yellow bodied (Y) white-eyed (W) females with brown bodied (Y+) red-eyed (W+) male which produced a brown bodied red-eyed product in Drosophila cross.

Also, Morgan detected that the two genes did not separate independently of each other on inter-crossing of F1 progeny. That is why the F2 ratio diverged expressively from the expected 9:3:3:1 ratio. Morgan concluded the amount of 98.7% to be parental and only 1.3% recombinants. 

(ii) Morgan also performed a second cross in Drosophila. This time the crossing was between white-eyed and miniature winged (wwmm) females with wild type or red-eyed normal winged (w+w+m+m+) males. The result of the crossing showed that all the F1 were found to be of wild type, i.e., red-eyed and normal winged. 

From the previous experiment of Morgan and his crew, an F1 female fly was cross-tested with a white-eyed and small, winged male. About 62.8% of the progeny was of parental types while 37.2% were recombinants. So, the right choice is '(B) 37.2'.

Q2. Which of the Following Disorders Is the Odd One?

(A) Thalassemia

(B) Phenylketonuria

(C) Sickle-cell Anemia

(D) Haemophilia

Ans: (A) 

Thalassemia is recognized as a group of a hereditary blood disorder which constrains the ability of the body to harvest haemoglobin and RBC.

Phenylketonuria: Phenylketonuria is recognized as a recessively inherited disorder. The patients having this disease suffer from a deficiency of the capability to synthesize an enzyme to convert the amino acid phenylalanine into tyrosine.

Sickle Cell Anaemia: Sickle Cell Anaemia is recognized as an autosomal recessive disorder. A single amino acid substitution is caused by the recessive allele in the beta chains of haemoglobin. The sickling of cells happens when the concentration of oxygen is low.

Haemophilia: People who have haemophilia shall possess a collection of diseases in which their blood doesn't clot normally. In the clotting of blood, many factors are involved. People having haemophilia have lacked the normal factor VIII. So, they are said to have haemophilia.

The above-mentioned disorders of haemophilia, phenylketonuria and Sickle Cell anaemia belong to the Mendelian type but Thalassemia is very much unlike. Therefore, the right choice of this question is A, Thalassemia.

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