In two pea plants having red (dominant) coloured flowers with unknown genotypes are crossed, 75% of the flowers are red and 25% are white. The genotypic constitution of the parents having red coloured flowers will be 

(1) both homozygous

(2) one homozygous and other heterozygous

(3) both heterozygous

(4) both hemizygous

Subtopic:  Monohybrid Cross: 1 |
 59%
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Genotypic and phenotypic ratios 1 : 2 : 1 in the offsprings explain the principle of 

(1) dominance

(2) blending inheritance

(3) recessiveness 

(4) All of the above

Subtopic:  Dominance Deviation from Mendel: 1 |
 59%
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Sickle cell anaemia is example of 

(1) sex-linked inheritance

(2) deficiency disease

(3) autosomal heritable disease

(4) infectious disease

Subtopic:  Mendelian Disorders: Sickle Cell Anemia |
 81%
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Holandric genes are located 

(1) both in X and Y-chormosome

(2) only in Y-chromosome

(3) only in X-chromosome

(4) only in autosomes

 

Subtopic:  Sex Linked Inheritance: Introduction |
 75%
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Which one of the following disorders and characteristic is correctly matched?

(1) Cystic fibrosis - Produciton of thick mucous that cloge airways

(2) Sickle cell anaemia - Brain deterioration beginning at months of age

(3) Achondroplasia - Extra fingers or toes

(4) Huntingon's disease - Skeletal, eye and cardiovascular defects

Subtopic:  Mendelian Disorders |
 56%
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Tay-Sachs disease results due to lack of enzyme

(1) glucokinase

(2) hexosaminidase A

(3) Pyruvate kinase

(4) Na- — K+ ATPase

Subtopic:  Mendelian Disorders |
 55%
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A woman is married for the second time. Her first husband was ABO blood type A, and her child by that marriage was type O. Her new husband is type B and their child is type AB. WHat is the woman's ABO genotype and blood type ?

(1) IAIO; Blood type A

(2) IAIB; Blood type AB

(3) IBIO; Blood type B

(4) IOIO; Blood type O

Subtopic:  Dominance Deviation from Mendel: 2 |
 77%
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Who is known as father of physiological genetics or father of biochemical genetics ?

(1) Slatyer

(2) Charles Elton

(3) Taylor

(4) Archibald Garrod

Subtopic:  Introduction to Genetics: 1 |
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For how many years Gregor Mendel conducted hybridisation experiments on garden peas?

(1) 5

(2) 7

(3) 14

(4) 34

Subtopic:  Introduction to Genetics: 2 |
 91%
From NCERT
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How many true breeding pea plant varieties had been selected by Mendel?

(1) 1

(2) 7

(3) 14

(4) 16

Subtopic:  Introduction to Genetics: 2 |
 70%
From NCERT
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