If yellow flower colour in a plant is controlled by an allele F and green flower colour is controlled by an allele f, which flower colour is dominant? If true-breeding yellow flowered plants are crossed with true-breeding green-flowered plants, what will be the flower colour(s) of the F1 plants?
Answers
Answer:
Given that :
- Yellow flower coloured plant allele = F
- Green flower coloured plant allele = f
According to rule, the dominant allele is written in capital letters where as the recessive allele is written in small letters.
Hence, yellow flower coloured plant is dominant.
Now, let us get to the result of crossing between true breeding yellow flower plant and true breeding green flower plant.
- Yellow flowered plant = FF
- Green flowered plant = ff
Hence, the 4 progenies we get has the genotype : Ff.
Hence, the colour of flowers of first generation plants will be yellow.
SOME IMPORTANT TERMS :
➸ Allele is one of the pair of genes that appears at a particular location on a particular chromosome and controls the same type of characteristic.
➸ Homozygous is an organism having two identical alleles of a particular gene.
➸ Heterozygous is an organism that has two different alleles of a particular gene.
➸ Dominant gene decides the appearance of an organism even in the presence of alternative contrasting gene.
➸ Recessive gene can decide the appearance of an organism only if there is a presence of another identical gene.