This structure is common in all vertebrates at embryonic stages:
Correct answer: A. Gill pouches
- A. Gill pouches
- B. 4 chambered heart
- C. Teeth
- D. Gills
Explanation
Gill pouches or gill slits are a common feature in all vertebrates during their embryonic stages. They are openings in the pharyngeal region that lead from the pharynx to the outside and are initially developed to support aquatic respiration. In some vertebrates, these gill pouches may develop into different structures or disappear during later stages of development.
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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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