1. Which typical stage is known for DNA replication?
A. S phase C. G2 phase
B. G1 phase D. Metaphase
2. Number of chromatids at metaphase is
A. two each in mitosis and meiosis
C. two in mitosis and one in meiosis
B. two in mitosis and four in meiosis
D. one in mitosis and two in meiosis
3. Synapsis occurs between
A. mRNA and ribosomes
B. Spindle fibers and centromere
B. a male and a female gamete
D. two homologous chromosomes
4. In meiosis the daughter cells differ from parent as well as
amongst themselves due to
A. segregation independent assortment and crossing over
B. segregation and crossing over
C. independent assortment and crossing over
D. segregation and independent assortment
A. S phase C. G2 phase
B. G1 phase D. Metaphase
2. Number of chromatids at metaphase is
A. two each in mitosis and meiosis
C. two in mitosis and one in meiosis
B. two in mitosis and four in meiosis
D. one in mitosis and two in meiosis
3. Synapsis occurs between
A. mRNA and ribosomes
B. Spindle fibers and centromere
B. a male and a female gamete
D. two homologous chromosomes
4. In meiosis the daughter cells differ from parent as well as
amongst themselves due to
A. segregation independent assortment and crossing over
B. segregation and crossing over
C. independent assortment and crossing over
D. segregation and independent assortment
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Answer:
1.A
2.A
3.D not sure po.
4.A
Answer:
1.A. S phase
•During S phase replication of DNA takes place. The nucleotides get assembled and DNA molecules are synthesized.
2.A.
• Number of chromatids at metaphase is two each in mitosis and meiosis. Chromatid is a half chromosome during duplication in early prophase and metaphase of mitosis and between diplotene and the second metaphase of meiosis. After these stages chromatids are called a daughter chromosomes.
3.D.
•Hint: The synapsis is a process that occurs between chromosomes just before the process of crossing over. This process helps in the pairing of chromosomes before the segregation process. Complete answer: The synapsis is the process by which pairing of homologous chromosomes occurs by crossing over.
4. C.
•In meiosis, the daughter cells differ from parent cell as well as amongst themselves due to segregation, independent assortment and crossing over. ... Meiosis leads to recombinations or new combinations of genes or characters as a result of crossing over.
Explanation:
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