DEVELOPMENTAL BIOLOGY SEVENTH
EDITION ACTUAL EXAM SCRIPT 2026
COMPLETE QUESTIONS AND SOLUTIONS
GRADED A PLUS
◉ Developmental biology
Answer: Study of changes from fertilization to adulthood
◉ Preembryonic stage
Answer: First 16 days after fertilization
◉ Embryonic stage
Answer: Begins at day 16 when germ layers form
◉ Fetal stage
Answer: Week 9 to birth
◉ Fertilization
, Answer: Union of sperm and egg to form zygote
◉ Zygote
Answer: Fertilized egg (diploid)
◉ Polyspermy
Answer: Fertilization by multiple sperm (fatal)
◉ Sperm migration
Answer: Sperm travel to uterine tube to meet egg
◉ Capacitation
Answer: Process that enables sperm to fertilize egg
◉ Acrosomal reaction
Answer: Release of enzymes to penetrate egg
◉ Hyaluronidase
Answer: Enzyme that breaks down granulosa cells
◉ Acrosin
Answer: Enzyme that digests zona pellucida