How many of the following statements are correct about Mendelian alleles? (A). The dominant allele expresses itself in the presence of an alternative allele. (B). The recessive allele does not express in the presence of the dominant allele.

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How many of the following statements are correct about Mendelian alleles? (A). The dominant allele expresses itself in the presence of an alternative allele. (B). The recessive allele does not express in the presence of the dominant allele. (C). The F₁ hybrid produced in a cross between homozygous dominant and homozygous recessive is heterozygous. (D). A homozygous individual for a trait breeds true and produces two

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Correct answer: B. (A), (B) and (C) only.

Statement (A) is correct. A dominant allele is defined as the one that expresses itself even in the presence of an alternative (recessive) allele in a heterozygous condition. Statement (B) is correct. A recessive allele is masked and does not express its phenotypic effect in the presence of a dominant allele. Statement (C) is correct. A cross between a homozygous dominant (e.g., TT ) and a homozygous recessive (e.g., tt ) yields an F₁ generation that is entirely heterozygous ( Tt ). Statement (D) is incorrect. A ho

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