{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

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

Info iconThis preview shows pages 1–12. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 4 Sex-Linked Inheritance
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Background image of page 2
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
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Life cycle of a diploid animal
Background image of page 4
Steps in a mitotic cell division The chromosome number does not change. Two daughter cells are produced in the end
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
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.
Background image of page 6
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.
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Pairing of homologous chromosomes and chiasma formation [due to crossing over (recombination) between sister chromatids]
Background image of page 8
Subsequent steps in meiosis I
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Steps in meiosis II
Background image of page 10
Alternative alignments of paired chromosomes in metaphase I
Background image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 12
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}