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26 July, 08:24

Which of the following statements is true?

1. All genes are dominant./

2. A hybrid organisms has one recessive gene and one dominant gene.

3. Genotype is the expression of a trait.

4. Only pea plants with two dominant genes for tallness will have a tall phenotype.

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  1. 26 July, 11:16
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    2nd statement is true.

    Explanation:

    Chromosomes are made up of genes and a gene is made up of two copies of alleles. If an organism has two different types of alleles on its chromosomes then it's a hybrid organism else we call it a pure organism/trait.

    Gene could be dominant or recessive. A phenotype is the expression of a trait. As 'tall' gene is considered to be dominant so so pea plant with even a single copy of 'tall' gene will have a tall phenotype.
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