16 Inherited Change (diagrams, key points, summary)

Inherited Change
CIE A LEVEL BIOLOGY




Jia Xuan
by

,CHROMOSOMES
KEY TERMS

Homologous chromosomes → chromosomes with .
same size I length
• same shape
.
same banding pattern
• same order of loci

→ chromosomes up in prophase I
pair




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t
Sexual reproduction




g
I. ad !!!
" 's
"" "


which contains only one set of
Chromosomes
✓
.




9mYYotYg Diploid ( 2n )
Lr> which




\ ¥
A cell contains two sets of
"
chromosomes .




2n
Fertilisation




GAMETOGENESIS

Gametogenesis of
→
production gametes
Tex cells for fertilisation




✓ production of
in humans eggs
-
/ production of sperm

Gametogenesis
\ in plants -
- production of
pollen grains
production of
embryo sac

, HUMANS



IN OOGENESIS LIM




1
oogenesis → The
production of eggs Ova in the ovaries




MITOSIS diploid




I t
I
" ro :


Yff I 1
)
GROWTH




MEIOSIS
V
diploid
primary oocyte
(
produced in
embryo )


#p -

v v
Secondary oocyte ⑧ haploid
( after puberty) polar body


#p v

secondary oocyte
( once a month )




\!
" "" """ °"




polar body
✓
ovum
haploid