Biology · Biology
What happens to homologous chromosomes in a zygote?
- 1They change in size.
- 2They become fragmented.
- 3They pair up.✓
- 4They separate.
Correct answer
They pair up.
Explanation
स्पष्टीकरण:
अर्धसूत्री विभाजन की ज़ायगोटीन अवस्था के दौरान समजात गुणसूत्र (Homologous chromosomes) एक-दूसरे के करीब आते हैं।
इस प्रक्रिया में माता और पिता से प्राप्त एक जैसे आकार और आनुवंशिक विशेषताओं वाले गुणसूत्र आमने-सामने आकर जोड़े बनाते हैं।
यह युग्मन (pairing) आनुवंशिक सामग्री के आदान-प्रदान (Crossing over) के लिए एक आवश्यक चरण है।
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