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Meiosis and producing genetically diverse Meiosis and producing genetically diverse offspringoffspring
Discussions start(ed) this week.Discussions start(ed) this week.
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This sideclose your eyes
This side keepyour eyes open
Try to remember what you are about to hear.
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This sideclose your eyes
This side keepyour eyes open
Try to remember what you are about to hear.
… It's about a kite.
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A newspaper is better than a magazine, and on a seashore is a better place than a street. At first it is better to run than to walk. Also you may have to try several times. It takes some skill but it’s easy to learn. Even young children can enjoy it. Once successful, complications are minimal. Birds seldom get too close. One needs lots of room. Rain soaks in very fast. Too many people doing the same thing can also cause problems. If there are not complications, it can be very peaceful. A rock will serve as an anchor. If things break loose from it, however, you will not get a second chance.
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Protein
Fig 17.3
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For life to exist, the information (genes) must be passed on.
{Mitosis:producing more cells}
{Meiosis:producing gametes}
Fig 13.5
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Mitosis: a DNA Perspective
Fig12.4
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Sister Chromatids are replicated DNA
Fig12.4
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Mitosis plays a role in:• Growth and Development• Repair and Turnover of Cells• Reproduction
–Asexual
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The Cell CycleFig 12.5
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startofmitosis
Fig 12.6
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For life to exist, the information (genes) must be passed on.
{Mitosis:producing more cells}
{Meiosis:producing gametes}
Fig 13.5
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vs.Asexual Reproduction
SexualReproduction
Fig 46.3
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extremely lowgenetic diversity
greater geneticdiversity
vs.Asexual Reproduction
SexualReproduction
How does sexual reproduction generate genetic diversity?
Fig 46.3
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Gene forblue eye pigment
Gene forbrown hair pigment
Gene forgrowth hormone
Haploidchromosomes
Gene forhemoglobin
Gene forDNA polymerase
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Gene forhemoglobin
Gene forhair color
Gene forgrowth hormone
Allele forblack hair
Allele forblack hair
Allele forlow express(short)
Allele forhigh express(tall)
Allele for normal Hb
Allele forsickle cell Hb
Diploidchromosomes
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Each pair of chromosomes is comprised of a paternal and maternal chromosome
Fig 13.3
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Fig 13.4
sister chromatids= replicated DNA (chromosomes)tetrad= pair of sister chromatids
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Fig 13.7
Meiosis splits apart the pairs of chromosomes.
X 23in humans
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haploid
diploid
X 23in humans X 23
in humans
X 23in humans
Inheritance = The interaction between genes inherited from Mom and Dad.
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Fig 12.2
Meiosis splits apart the pairs of chromosomes.
X 23in humans
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extremely lowgenetic diversity
greater geneticdiversity
vs.Asexual Reproduction
SexualReproduction
How does sexual reproduction generate genetic diversity?
Fig 46.3
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Fig 13.12
DNA cut and religated
DNA cut and religated
Crossing-over(aka Recombination)
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Crossing-over:Proteins in the cell cut and religate the DNA, increasing the genetic diversity in gametes.
Fig 13.12
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Fig 13.12
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Fig 13.11 Independent Assortment(aka Random Assortment)
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Independent Assortment
2 possibilities for each pair,
for 2 pairs22 = 4
combinations
Fig 13.11
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Independent Assortment
2 possibilities for each pair, for 23 pairs
223 = 8,388,608
combinations
Fig 13.11
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extremely lowgenetic diversity
greater geneticdiversity
vs.Asexual Reproduction
SexualReproduction
How does sexual reproduction generate genetic diversity?
Fig 46.3
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Meiosis and producing genetically diverse Meiosis and producing genetically diverse offspringoffspring
Discussions start(ed) this week.Discussions start(ed) this week.