Entrance Exams
Govt. Exams
Anagenesis refers to phyletic evolution or linear evolution where one species gradually transforms into another without branching.
All offspring being tall when crossed with dwarf (tt) indicates the tall parent is TT. If it were Tt, approximately half offspring would be dwarf.
If q = 0.3, then p = 0.7. Heterozygous frequency = 2pq = 2(0.7)(0.3) = 0.42
According to Hardy-Weinberg principle, total allele frequencies must equal 1. Therefore, 1 - (0.4 + 0.3 + 0.2) = 0.1
AB parents (IAIB × IAIB) produce IAIA, IAIB, and IBIB only. O group (ii) requires two recessive alleles, which neither parent possesses.
1:1 ratio indicates heterozygous tall plant (Tt) crossed with homozygous recessive dwarf (tt).
'Fitness' in evolutionary context means reproductive success—leaving maximum viable offspring, not physical strength.
Female XWXw × Male XwY produces: XWXw (red female), XwXw (white female), XWY (red male), XwY (white male). Correcting: produces XWXw (red female) and XwY (white male) primarily.
Dark moths increased in polluted areas not by developing dark color, but because pre-existing dark variants had survival advantage.
Genetic drift causes random, unpredictable changes in allele frequencies, particularly significant in small isolated populations.