A person with 47 chromosomes due to an additional Y-chromosome suffers from a condition called
Down's syndrome
Super female
Turner's syndrome
Klinefelter's syndrome
A family of five daughters only is expecting the sixth issue. The chance of its being a son is
Zero
25%
50%
100%
A monohybrid cross between two plants, one having 24cm long internodes and the other having 12cm long internodes, produced F1-hybrids all having 18 cm long internodes. This is a case of
recessive dominance
multiple allelism
complete dominance
incomplete dominance
The mutations are mainly responsible for
constancy in organisms
variation in organisms
increasing the population rate
maintaining genetic continuity
Mutations used in agriculture are commonly
induced
spontaneous
lethal
recessive and lethal
In Mirabilis jalapa, when red colour flowers were crossed with white colour flowers, pink colour flowers were obtained. It was due to
epistasis
crossing over
Haemophilia is more common in males because it is a
recessive character carried by Y-chromosome
dominant character carried by Y-chromosome
dominant trait carried by X-chromosome
recessive trait carried by X-chromosome
How many pairs of contrasting characters in pea pod were chosen by Mendel?
2
3
4
7
Mendel enunciated
two principles of inheritance
three principles of inheritance
four principles of inheritance
five principles of inheritance
Which contributed to the success of Mendel?
Qualitative analysis of data
Observation of distinct inherited traits
His knowledge of Biology
Consideration of one character at one time
