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(a) Leptotene. The centrioles, already duplicated, move apart
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(a) Leptotene. The centrioles, already duplicated, move apart in pairs

(a) Leptotene. The centrioles, already duplicated, move apart in pairs. Astral rays appear around each pir of centrioles to form an aster. Spindle begins to develop between the centriole pairs. Chromosomes ifferentiate from chromatin fibres. They are very long, fine filaments (G. leptos = fine; tene = thread). They are double, each consisting of two identical chromatids due to DNA replication during premeiotic iterphase. The chromatids are, however, very closely adhered together and are indistinct (Fig. 11.14). Each chromosome is attached by both of its ends to the nuclear matrix that lines the nuclear envelope with the help of a specialized structure termed the attachment plate.

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(a) Leptotene. The centrioles, already duplicated, move apart in pairs. Astral rays appear around each pir of centrioles to form an aster. Spindle begins to develop between the centriole pairs. Chromosomes ifferentiate from chromatin fibres. They are very long, fine filaments (G. leptos = fine; tene = thread). They are double, each consisting of two identical chromatids due to DNA replication during premeiotic iterphase. The chromatids are, however, very closely adhered together and are indistinct (Fig. 11.14). Each chromosome is attached by both of its ends to the nuclear matrix that lines the nuclear envelope with the help of a specialized structure termed the attachment plate.
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Question Text
(a) Leptotene. The centrioles, already duplicated, move apart in pairs. Astral rays appear around each pir of centrioles to form an aster. Spindle begins to develop between the centriole pairs. Chromosomes ifferentiate from chromatin fibres. They are very long, fine filaments (G. leptos = fine; tene = thread). They are double, each consisting of two identical chromatids due to DNA replication during premeiotic iterphase. The chromatids are, however, very closely adhered together and are indistinct (Fig. 11.14). Each chromosome is attached by both of its ends to the nuclear matrix that lines the nuclear envelope with the help of a specialized structure termed the attachment plate.
Updated OnJul 24, 2022
TopicGenetics and Evolution
SubjectBiology
ClassClass 11
Answer Type Video solution: 1
Upvotes77
Avg. Video Duration10 min