Round seed trait (R) is dominant over wrinkled (r) seed trait in Pea. Heterozygous round seeded plant (Rr) is crossed with wrinkled seed plant (rr). What is the possible progeny?

1. 302 round : 102 wrinkled

2. 210 round : 95 wrinkled

3. 103 round : 99 wrinkled

4. 103 round : 315 wrinkled

Subtopic:  Monohybrid Cross: 1 |
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In human child, sex is determined by

1. Size and number of sperms in semen

2. Size of egg to be fertilized

3. Sex chromosomes of father

4. Sex chromosomes of mother

Subtopic:  Sex Determination |
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A dihybrid cross produces the following progeny - AaBb = 240; Aabb =754; aaBb = 746; aabb = 260. What is the distance between the two genes on the chromosome?

(1) 12.5 map units

(2) 1 map unit

(3) 20 map units

(4) 25 map units

Subtopic:  Recombination Gene Mapping |
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Male pattern baldness is a          trait

(1) sex-linked

(2) sex-limited

(3) sex-influenced

(4) Y-linked

Subtopic:  Conclusion |
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A colour blind girl is rare because she will be born only when 

(1) Her mother and maternal grand father were colour blind

(2) Her father and maternal grand father were colour blind

(3) Her mother is colour blind and father has normal vision

(4) Parents have normal vision but grand parents were colour blind. 

Subtopic:  Sex Linked Recessive Inheritance |
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Identify the incorrect statement regarding experiments on Pisum sativum by Gregor Mendel?

(1) He conducted hybridisation experiments on garden peas for seven years (1856-1863) and proposed the laws of inheritance in living organisms.

(2) It was for the first time that statical analysis and mathematical logic were applied to problems in biology.

(3) Unfortunately his experiments had a small sampling size, which gave less credibility to the data that he collected.

(4) He investigated characters in the garden pea plant that were manifested as two opposing traits. 

Subtopic:  Introduction to Genetics: 1 |
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Which of the following is a recessive trait for a character choosen by Mendel in garden pea?

(1) Violet flower color

(2) Yellow pod color

(3) Axial flower position

(4) Tall stem height

Subtopic:  Introduction to Genetics: 2 |
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Indentify the incorrect statement:

(1) Tall plant produce gametes by meiosis and the dwarf plants by mitosis.

(2) Only one allele is transmitted to a gamete.

(3) The segregation of alleles is a random process.

(4) Gametes will always be pure for the trait.

 

Subtopic:  Monohybrid Cross: 1 |
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The ultimate source of allelic variation is:

(1) Recombination

(2) Natural selection

(3) Mutation

(4) Drift

Subtopic:  Linkage |
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In the case of co-dominance, the F1 generation resembles:

(1) Dominant parent

(2) Recessive parent

(3) Both the parents

(4) None of the parents

Subtopic:  Dominance Deviation from Mendel: 1 |
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