Recombination: the process of creating unique organisms (zygote) with variations when sperm
and egg combine, occurs during fertilization
Differentiation: the process of developmental cells becoming specialized with their own
structures and functions, ex- brain cells, blood cells, heart cells…
Practice Regents Questions:
1. When organisms reproduce sexually, the species number of chromosomes is
maintained. Complete the following diagram:
Organism with 10 chromosomes in body cells
Goes through Process A to create
Gamete Cell
Goes through Process B to create
Zygote
Goes through Process C to create a
Multicellular Organism
Name of Process A and # of chromosomes in gamete:
Name of Process B and # of chromosomes in zygote:
Name of Process C and # of chromosomes in a cell of the multicellular organism:
2. Which is arranged in the correct sequence?
a) Fertilization, embryo development, meiosis, birth
b) Embryo development, meiosis, fertilization, birth
c) Meiosis, fertilization, embryo development, birth
d) Fertilization, meiosis, embryo development, birth
Answers:
1. Process A- Meiosis, # of chromes- 5
Process B- fertilization or recombination, # of chromes- 10
Process C- mitosis or differentiation or embryo development, # of chromes- 10
2. C- meiosis creates gametes, fertilization joins gametes, embryo development allows
embryo to grow, birth is when fetus is ready to be independent