# 1Betul/Salah
In mitosis, chromosomes align at the center of the cell during metaphase
LEVEL 2: CHROMOSOME CHAOS"
SUREKHA LAKSHM
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LEVEL 2: CHROMOSOME CHAOS"
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LEVEL 2: CHROMOSOME CHAOS"
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# 2Betul/Salah
During meiosis, genetic variation is introduced through crossing over, which occurs in metaphase I
# 3Betul/Salah
The spindle fiber is responsible for pulling chromatids apart during cell division
# 4pilihan
Which of the following is NOT a component of DNA?
A) Deoxyribose sugar
B) Phosphate group
C) Amino acids
D) Nitrogenous base
# 5pilihan
What is the role of genes in an organism?
A) Controlling inherited characteristics
B) Providing structural support to cells
C) Transporting oxygen in the blood
D) Producing energy for the cell
# 6pilihan
DNA is made of repeating units called:
A) Chromosomes
B) Nucleotides
C) Ribosomes
D) Enzymes
# 7pilihan
Why is meiosis important in reproductive cells, and how does it affect chromosome number in offspring?
A) It ensures offspring receive twice the number of chromosomes from each parent
B) It maintains the chromosome number by reducing it by half in gametes
C) It creates new chromosomes not found in the parents
D) It doubles the number of chromosomes in reproductive cells
# 8pilihan
Diagram 3 shows two stages in meiosis
What is the chromosomal behavior at stage P ?
A) Chromosome thicken and condense
B) Chromosomes arrange themselves around equatorial plane
C) Homologous chromosomes pair together and crossing-over occurs
D) Homologous chromosomes separate and move to the opposite poles
# 9pilihan
What is the key difference between prophase I of meiosis and prophase of mitosis?
A) DNA replication only occurs in meiosis
B) Homologous chromosomes pair up and crossing over occurs in meiosis
C) Spindle fibers do not form in meiosis
D) Chromosomes do not condense in mitosis
# 10pilihan
During which stage of meiosis do homologous chromosomes separate?
A) Prophase I
B) Metaphase I
C) Anaphase I
D) Telophase II
# 11pilihan
8. Diagram 11 shows a stage in one of the phases in meiosis
What is the importance of R ?
A) Replace dead cells
B) Variation among the species
C) Maintains diploid chromosome number in a zygote
D) Causes genetically identical from the parent cell to the next generation
# 12pilihan
Which of the following best describes the cells produced at the end of meiosis?
A) Diploid and identical
B) Haploid and genetically different
C) Diploid and genetically different
D) Haploid and identical
# 13pilihan
Diagram 4 shows a phase in mitosis
What is this phase ?
A) Prophase
B) Metaphase
C) Anaphase
D) Telophase
# 14Jawapan pendek
Diagram 1 shows the stages of cell division.
i) Name the type of cell division as shown in Diagram 1
ii) Name the structure W
iii) How many structures W in each cell at stage P?
i) Mitosis ii) Chromosome iii) 46
mitosis
chromosome
46
# 15Jawapan pendek
i) State the importance of the process in Diagram 1
ii)What happens to the chromosomes during stage C
iii)What is the effect of the process in (ii) on the offspring?
i) Production of gametes or four non-identical daughter cells. ii) Crossing over iii) Exchange of genetic information between homologous chromosomes and cause variation
Production of gametes or four non-identical daughter cells. Crossing over . Exchange of genetic information between homologous chromosomes and cause variation
four non-identical daughter cells, crossing over, exchange of genetic information
four daughter cells, crossing over, exchange of genetic information
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