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biologia7
1.
2.
44 XY 44
XX 44 XY 22 X 22 X22 Y 44 XX SPERMS OVULES SEX DETERMINISM IN HUMANS HETEROGAMETIC SEX HOMOGAMETIC SEX
3.
4646 23 23 46 46 46 46
4.
Variability causes in
Meiosis 1.Homologous Chromosomes Separation during ANAPHASE I.
5.
6.
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
7.
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
8.
Variability causes in
Meiosis 2. Crossing over RECOMBINATION OF GENES
9.
Random Crossing over
between homologous chromosomes, as a result........
10.
Imagine that Recombination
takes place only in one pair of Chromosomes. From the mother cell after Meiosis would appear four types of ovules.
11.
12.
MEIOSIS I MEIOSIS: A
GENERAL VISION MEIOSIS II
13.
23 from father 23
from mother.
14.
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.
15.
16.
Crossing over and
Recombination
17.
18.
The main events
in Meiosis 2. Random Crossing over between homologous chromosomes 1.Homologous Chromosomes Separate during ANAPHASE I
19.
1 2 34 5 6
20.
HOMOLOGOUS HOMOLOGOUS CHROMOSOMES ALIGN ALONG METAPHASE PLATE PROPHASE
I
21.
d) Anaphase I
22.
PROPHASE II
23.
i) Anaphase II
24.
Variability causes in
Meiosis 1. Crossing over 3.Separation of sister Chromatides during ANAPHASE II 2.Homologous Chromosomes Separation during ANAPHASE I
25.
26.
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
27.
1. Crossing over Exchange
of Genetic Material between Homologous Chromosomes
28.
2.Homologous Chromosomes Separation during ANAPHASE I Either or A
B A B
29.
A1 A2 A1 A2 A3 A4
A3 A4 ANAPHASE II 3.Separation of sister Chromatides during ANAPHASE II
30.
A B A
A B B C C C C REPLICATION S H O M O L O G O U S
31.
C C C
C SYNAPSIS
32.
C C C
C SYNAPSIS
33.
C C C
C SYNAPSIS
34.
CCCCCC
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