Govt. Exams
Entrance Exams
Segregation of alleles and recombination during meiosis create genetic variation in offspring, leading to phenotypic differences.
Antibiotic resistance emerges through natural selection. Resistant bacteria survive antibiotic treatment and reproduce, increasing resistance frequency in the population.
For AaBb × AaBb: probability of aa = 1/4, probability of bb = 1/4. Combined: 1/4 × 1/4 = 1/16
Variation provides the raw material for natural selection. Without variation, there would be no differential reproductive success.
Cross: Ff × FF produces FF and Ff offspring. All are phenotypically normal. Probability of affected (ff) child = 0%
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.
