Embryological evidence
Explanation:
Deuterostomes include echinoderms, hemichordates, and chordates. Despite their diverse body structures, they all feature a mouth that forms secondarily during embryonic development, thought to be a derived evolutionary trait connecting a common ancestor to all its descendants (a synapomorphy). This mouth originates from the ectoderm layer through invagination opposite the blastopore in the gastrula.
The variations caused by genetic modification lead to alterations in the organism's genome. Such changes express traits in ways that differ from the typical. These variations can cause genetic mutations that may be passed down generations.
In the case of sexual reproduction, the organism's genome remains unchanged. Here, only an exchange occurs between the alleles inherited from each parent, and this does not result in mutations.
Examples of biological macromolecules that depend on hydrogen bonding include proteins, nucleic acids, and polysaccharides. Hydrogen bonding plays a crucial role in numerous chemical processes and helps define the three-dimensional structure of folded proteins, which consist of enzymes and antibodies.
The probability of generating plants with white axial flowers is 1/16. Based on the given illustration, all F1 offspring exhibited red axial flowers, indicating that the genes for red and axial traits are dominant over those for white and terminal traits in pea plants. Let's denote the allele for flower color as A (red) and a (white), and for flower position as B (axial) and b (terminal). The genotype of pure-breeding red axial flowers would be AABB, while pure-breeding white terminal flowers are represented as aabb. Crossing these results in F1 genotype AaBb, which shows all red axial flowers. For the F2 generation from AaBb crossed with AaBb, the progeny breakdown is: 9 A_B_ red/axial, 3 A_bb red/terminal, 3 aaB_ white/axial, and 1 aabb white/terminal. Consequently, the chance of generating plants with white axial flowers in the F2 generation is 1/16.
