science
Grade-10
Easy

Question

In the given diagram, all the f1 progeny is yellow because:

  1. f1 genotype is homozygous.

  2. Yellow is dominant over green.

  3. Both parents had alleles for yellow colour.

  4. None of the above.

hintHint:

Genotype of the parents decide the phenotype of the offspring.

The correct answer is:

Yellow is dominant over green.


    • The phenotype of F1 generation will be all dominant if the parents are heterozygous 
    • The genotype of the all F1generation will be same and heterozygous
    • The offspring genotype is the result of the combination of genes in the gametes 
    • The dominant gene always masks the effect of recessive gene
    • Punnett square can be used to demonstrate the genotypes of the offspring
    Gametes Y Y
    y Yy Yy
    y Yy Yy

    • F1 generation of parents with homozygous genes (one dominant and other recessive) will be all dominant
    • F2 generation will have both dominant and recessive phenotypes with different genotypes

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