Phenotype of an organism is the result of
mutations and linkages
cytoplasmic effects and nutrition
environmental changes and sexual dimorphism
environmental changes and sexual dimorphism
C.
environmental changes and sexual dimorphism
Phenotype is the observable characteristics or the total appearance of an organism. It is determined by its genes, the dominance relationships between the alleles and by the interaction during development between its genetic constitution (genotype) and the environment.
Mutation leads to variation and linkage to store genatype. Cytoplasmic effect a nutrition generally do not determine the phenatype.
Which one of the following is the most suitable, medium for culture of Drosophila melanogaster?
Moist bread
Agar agar
Ripe banana
Ripe banana
Which one of the following is an example of polygenic inheritance?
Flower colour in Mirabilis jalapa
Production of male honey bee
Pod shape in garden pea
Pod shape in garden pea
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 x rryy?
Only round seeds with green cotyledons
Only wrinkled seeds with yellow cotyledons
Only wrinkled seeds with green cotyledons
Only wrinkled seeds with green 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?
50:50
9:1
1:3
1:3
