18 Questions
During which stage of meiosis does crossing over occur?
Prophase-I
What is the significance of crossing over in meiosis?
It leads to unique combinations of genetic material
Why are unicellular organisms that reproduce asexually at a higher risk of extinction compared to sexually reproducing organisms?
They lack genetic variation
Which stage of meiosis involves synapsis, where homologous chromosomes pair up?
Prophase-I
How many possible genetic combinations can be produced by a human cell with 23 pairs of homologous chromosomes?
Over 8 million possibilities
What is the term for the structures formed when homologues are linked together during crossing over?
Chiasmata
In humans, how many gametes are produced after one cycle of meiosis from a cell with 23 pairs of homologous chromosomes?
4
What is the main advantage of genetic flexibility in a population for handling changing ecological conditions?
Better adaptation to changing environments
What is the term used to describe the process of homologous chromosomes coming together and pairing up during prophase-I of meiosis?
Synapsis
What is the maximum number of chiasmata (cross-shaped structures) that can form between a pair of homologous chromosomes during crossing over?
Multiple chiasmata can form
Which of the following statements accurately describes the genetic composition of sister chromatids after crossing over?
One sister chromatid is identical to the parental chromosome, while the other has a new combination of genetic material.
What is the primary advantage of genetic variation introduced by meiosis and crossing over in a population?
It provides better adaptation to changing environmental conditions.
What is the term used to describe the unique combinations of genetic material derived from both parents that are formed in one of the sister chromatids after crossing over?
Novel combinations
If crossing over did not occur during meiosis, what would be the consequence for genetic variation in a population?
Decreased genetic variation due to lack of novel genetic combinations
During which stage of meiosis do the sister chromatids separate and assort independently as genetically distinct gametes?
Metaphase-II
What is the term used to describe the process of DNA being broken and reconnected in a crisscross pattern during crossing over?
Recombination
Which of the following statements accurately describes the significance of crossing over in meiosis?
It introduces new genetic variations in the population pool with each cycle of meiosis and fertilization.
What is the term used to describe the genetic material that makes up each chromosome, consisting of two identical strands?
Sister chromatids
Explore the process of inheritance and the transmission of genetic information through meiosis and fertilization. Learn about the continuity of life and the concept of heredity across generations.
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