‘Heredity and Variation’/’Principles of Inheritance and Variation’ Questions: Solve online MCQs (Multiple Choice Questions) with answers and test reporting. Test No. 4
Heredity and Variation: MCQs Quiz - 4
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If 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
One homozygous and other heterozygous
In a given plant, red colour (R) of fruits is dominant over white fruit (r); and tallness (T) is dominant over dwarfness (t). If a plant with genotype RrTt is crossed with a plant of genotype rrtt, what will be the percentage of tall plants with red fruits in the next generation?
In Drosophila, the sex is determined by:
The ratio of pairs of X-chromosomes to the pairs of autosomes
X and Y chromosomes
The ratio of number of X-chromosomes to the sets of autosomes
Whether the egg is fertilized or develops parthenogenetically
In Mendel's experiments with garden pea, round seed shape (RR) was dominant over wrinkled seeds (rr), yellow cotyledon (YY) was dominant over green cotyledon (yy). What are the expected phenotypes in the F2 generation of the cross RRYY × rryy?
Only wrinkled seeds with green cotyledons
Only wrinkled seeds with yellow cotyledons
Only round seeds with green cotyledons
Round seeds with yellow cotyledons, and wrinkled seeds with yellow cotyledons
In pea plants, yellow seeds are dominant to green. If a heterozygous yellow seeded plant is crossed with a green seeded plant, what ratio of yellow and green seeded plants would you expect in F1 generation?
3 : 1
50 : 50
9 : 1
1 : 3
Mating of an organism to a double recessive in order to determine whether it is homozygous or heterozygous for a character under consideration is called
When a tall plant with round seeds (TTRR) crossed with a dwarf plant with wrinkle seeds (tfrr). The F1 generation consists of tall plants with round seeds. What would be the proportion of dwarf plant with wrinkle seeds in F1 generation?
Phenotype of an organism is the result of
Environmental changes and sexual dimorphism
Cytoplasmic effects and nutrition
Mutations and linkages
Genotype and environment interactions
Sickle cell anemia is
Characterized by elongated sickle like RBCs with a nucleus
An autosomal linked dominant trait
Caused by substitution of valine by glutamic acid in the β globin chain of haemoglobin
Caused by a change in a single base pair of DNA
Which one of the following conditions correctly describes the manner of determining the sex in the given example?
Homozygous sex chromosomes (XX) produce male in Drosophila
Homozygous sex chromosomes (ZZ) determine female sex in birds
XO type of sex chromosomes determine male sex in grasshopper
XO condition in humans as found in Turner Syndrome, determines female sex
Test cross of dihybrid ratio 1 : 1 : 1 : 1 then it proves that
F1 hybrid produces four different progenies
F1 hybrid produces two different progenies
F1 hybrid is homozygous
Four different progenies are produced by parents
The F2 generation offspring in a plant showing incomplete dominance, exhibit
variable genotypic and phenotypic ratios
a genotypic ratio of 1 : 1
a phenotypic ratio of 3 : 1
similar phenotypic and genotypic ratios of 1 : 2 : 1
Two genes R and Y are located very close on the chromosomal linkage map of maize plant. When RRYY and rryy genotypes are hybridized, the F2 segregation will show:
Higher number of the parental types
Higher number of the recombinant types
Segregation in the expected 9 : 3 : 3 : 1 ratio
Segregation in 3 : 1 ratio
Two pea plants were subjected cross pollination. Of the 183 plants produced in the next generation, 94 plants were found to be tall and 89 plants were found to be dwarf. The genotypes of the two parental plants are likely to be
TT and tt
Tt and Tt
Tt and tt
TT and TT
Which of the following pair of features is a good example of polygenic inheritance?
Hair pigment of mouse and tongue rolling in humans
ABO blood group in humans and flower colour of Mirabilis jalapa
Human height and skin colour
Human eye colour and sickle cell anaemia
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