In a plant, red fruit (R) dominant over yellow fruit (r) and tallness (T) is dominant over shortness (t). If a plant with RRTT genotype is crossed with a plant that is rrtt. Then

(1) 25% will be tall with red fruit

(2) 50% will be tall with red fruit

(3) 75% will be tall with red fruit

(4) All of the offspring will be tall with red fruits 

Subtopic:  Dihybrid Cross Analysis |
 64%
From NCERT
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A man whose father is a colourblind, marry a woman, who is a daughter of colourblind mother. The offspring of this couple will be

(1) all daugher and sons are colourblind

(2) 50% colourblind and 50% normal son

(3) carrier normal daugher and colourblind sons

(4) colourblind sons and normal daughter

 

Subtopic:  Sex Linked Inheritance: Characteristics |
 74%
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A pea plant parent having violet-coloured flowers with unknown genotype was crossed with a plant having white-coloured flowers. In the progeny, 50% were white. The genotypic constitution of the parent having violet-coloured flowers was

1. homozygous

2. merozygous

3. heterozygous

4. hemizygous

Subtopic:  Monohybrid Cross: 1 |
 86%
From NCERT
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The number of linkage group(s) present in Escherichia coli is 

(1) One

(2) two

(3) four

(4) seven

Subtopic:  Understanding Linkage |
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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 |
 58%
From NCERT
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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 |
 58%
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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%
From NCERT
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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 |
 74%
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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 |
 54%
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