Chapter_04

Chapter_04 - Chapter 4 Sex-Linked Inheritance A cell cycle...

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Chapter 4 Sex-Linked Inheritance
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A cell cycle showing the 4 stages The M-stage is the shortest stage. In addition to the 4 stages, two checkpoints and the 2 kinds of protein complexes (cyclin+kinase) needed to drive through the checkpoints are also shown
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Life cycle of a diploid animal
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Steps in a mitotic cell division The chromosome number does not change. Two daughter cells are produced in the end
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Steps in a meiotic cell division Two successive cell divisions occur resulting in 4 daughter cells. Pairing of homologous chromosomes occurs and the chromosome number is halved in the first division. The second division is identical to mitosis.
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Details of the steps in meiosis prophase I During this phase, exchange of parts of chromatids (visible as X-shaped structures called chiasmata) follows chromosome pairing. There is a mistake in this diagram. Each chromosome in leptotene, zygotene and pachytene should have 2 chromatids. The paired homologous chromosomes in zygotene and early pachytene should have 4 strands.
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Pairing of homologous chromosomes and chiasma formation [due to crossing over (recombination) between sister chromatids]
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Subsequent steps in meiosis I
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This note was uploaded on 06/09/2008 for the course CBN 356 taught by Professor Merill during the Spring '08 term at Rutgers.

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Chapter_04 - Chapter 4 Sex-Linked Inheritance A cell cycle...

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