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    biologia7 biologia7 Presentation Transcript

    • 44 XY 44 XX 44 XY 22 X 22 X22 Y 44 XX SPERMS OVULES SEX DETERMINISM IN HUMANS HETEROGAMETIC SEX HOMOGAMETIC SEX
    • 4646 23 23 46 46 46 46
    • Variability causes in Meiosis 1.Homologous Chromosomes Separation during ANAPHASE I.
    • A A A A B B b b C C C C D D D D E E e e F G F F F G g g
    • A B C D E F G A B C D e F g AA b C D e F g b C D E F G
    • Variability causes in Meiosis 2. Crossing over RECOMBINATION OF GENES
    • Random Crossing over between homologous chromosomes, as a result........
    • Imagine that Recombination takes place only in one pair of Chromosomes. From the mother cell after Meiosis would appear four types of ovules.
    • MEIOSIS I MEIOSIS: A GENERAL VISION MEIOSIS II
    • 23 from father 23 from mother.
    • A B C D1 E F3 G2 H9 A B C D1 E F3 G2 H9 I J K L M N1 O1 P Q I J K L M N1 O1 P Q A b C D2 E F1 G2 H9 A b C D2 E F1 G2 H9 i J k L2 m N1 O3 P q i J k L2 m N1 O3 P q They take genes for the same Traits but can take different versions. Observe the Example.
    • Crossing over and Recombination
    • The main events in Meiosis 2. Random Crossing over between homologous chromosomes 1.Homologous Chromosomes Separate during ANAPHASE I
    • 1 2 34 5 6
    • HOMOLOGOUS HOMOLOGOUS CHROMOSOMES ALIGN ALONG METAPHASE PLATE PROPHASE I
    • d) Anaphase I
    • PROPHASE II
    • i) Anaphase II
    • Variability causes in Meiosis 1. Crossing over 3.Separation of sister Chromatides during ANAPHASE II 2.Homologous Chromosomes Separation during ANAPHASE I
    • A B C D E F G A B C D e F g AA b C D e F g b C D E F G
    • 1. Crossing over Exchange of Genetic Material between Homologous Chromosomes
    • 2.Homologous Chromosomes Separation during ANAPHASE I Either or A B A B
    • A1 A2 A1 A2 A3 A4 A3 A4 ANAPHASE II 3.Separation of sister Chromatides during ANAPHASE II
    • A B A A B B C C C C REPLICATION S H O M O L O G O U S
    • C C C C SYNAPSIS
    • C C C C SYNAPSIS
    • C C C C SYNAPSIS
    • CCCCCC