If one allele is missing, the organism is:
Correct answer: C. Hemizygous
- A. Heterozygous
- B. Homozygous
- C. Hemizygous
- D. None of these options is correct
Explanation
Option A; If the two versions are different, you have a heterozygous genotype for that gene. For example, being heterozygous for hair color could mean you have one allele for red hair and one allele for brown hair. The relationship between the two alleles affects which traits are expressed. Option B:homozygous means having two identical alleles of a particular gene or genes. Option C:hemizygous describes an individual who has only one member of a chromosome pair or chromosome segment rather than the usual two. Hemizygosity is often used to describe X-linked genes in males who have only one X chromosome
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About Inheritance
Mendel's laws explain segregation, independent assortment and the prediction of genetic ratios using alleles, genotypes and phenotypes. The chapter also covers linked genes, recombination and crossing over during meiosis, then applies pedigree reasoning to X-linked recessive traits, which show different inheritance patterns in males and females.
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