Entrance Exams
Govt. Exams
Embryological similarities, such as gill slits in vertebrate embryos, demonstrate common evolutionary ancestry among different species.
Type AB blood group is codominant, expressed as IAIB, where both IA and IB alleles are expressed equally.
1:2:1 ratio indicates Aa × Aa, where offspring are 1 AA : 2 Aa : 1 aa. This is the typical F2 ratio for a monohybrid cross.
Most mutations are either neutral or harmful; only rarely are they beneficial. This is a key principle in evolutionary biology.
White-eyed female (XwXw) × red-eyed male (XWY). F1 females receive Xw from mother and XW from father, making them XWXw (red-eyed carriers).
Homologous structures are similar due to common ancestry with modification over time—classical evidence for divergent evolution.
Cross AA × Aa produces AA and Aa offspring only. Cystic fibrosis requires aa genotype, so probability is 0%.
3:1 ratio (75% yellow : 25% green) is characteristic of monohybrid cross between two heterozygotes (Yy × Yy).
Vestigial structures are anatomical remnants that indicate common ancestry with other organisms, supporting comparative morphology evidence.
Man (IAIB) × Woman (ii) produces IAi (Group A) and IBi (Group B) offspring only. O group requires ii genotype.