Which of the following statements is false?

Question

BlackTom AI · Accepted Answer

The statement 'A homozygote has different alleles for a given gene.' is false. In genetics, a homozygote refers to an organism that has two identical alleles for a specific gene. This is in contrast to a heterozygote, which has two different alleles for a gene. The concept of homozygosity is crucial in understanding genetic inheritance and expression, as it often leads to the expression of recessive traits when both alleles are recessive.

Comparatively, the statement 'A chromosome carries many genes.' is true. Chromosomes are long DNA molecules that contain many genes, regulatory elements, and other nucleotide sequences. Each chromosome can carry hundreds to thousands of genes, depending on its size and the organism.

The statement 'An allele is a form of a gene.' is also true. Alleles are different versions of a gene that arise by mutation and are found at the same place on a chromosome. They can result in different traits, such as eye color or blood type, depending on their dominance and interaction with other alleles.

Lastly, 'A true-breeding individual is homozygous.' is true. True-breeding refers to organisms that, when self-fertilized or crossed with another true-breeding organism of the same phenotype, produce offspring with the same phenotype. This occurs because the organism is homozygous for the traits in question, ensuring that the same alleles are passed on to the offspring.

Thus, the false statement is the first one, as it incorrectly defines homozygosity, which is fundamentally about having identical alleles for a gene, not different ones.

Which of the following statements is false?单项选择题

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