育教僑華而三第張九第日七初月二十年未己腦愛
WAH KIU YAT PO
報日僑華
生
1980
中學會考試題預習專欄
物
CIA).
明德出版社梁永華提供資料
Binlogy (16)
w.w, Leung:
(Mill & Dale Press Ltd)
Unit 12 Genetics
1.
I
In man, brown-eye is due to dominant gene ♬ and blue- to its recessive allele.b. The following diagram 18 family trec. A square
repts a man and a·
'circle a woman, Black
represents brown-eye and white blue-eye.
1.
a
(a) What is the genotype of
individual 12 Explain'it.
(b) Is it possible to
determine the genotype of individual 9? Why ? (c) If individual 3 and 4
had as many as 8 children, how many of them would be expected. tn be: hlue-eyed, why? (d) If individual 9 marries
a blue-eyed man and they produce both blue-eyed and brown-eyed children. Vhat is the genotype of
92 Explain it
(e) 1f individual 8 marries
a brown-eyed woman, the first child is blue-eyed. What are the genotypes of the parent? Explain it.
The inheritance of hair. colour in guinea pigs follows the
Mendel's first
law Suppose we have 3 groups of guinea pigs in mur laboratóry, whose genotypes and phenotypes are known
Group A homozygous black
homozygous brown (by
C. heterozygous black.
Black hair is a dominant character while brown hair is a recessive one. APN
One day, your teacher gives you a guinea pig with black hair and asks you to prove whether it is heterozygous or homozygqus. Explain how you would prove it..
l(a) The genotype of individuali is Bh; hecause he has both brown-eyed and blue-eyed. children, they receive one dominant gene and one recessive gener from hin respectively.
(b) Ve cannot determine S
whether the genotype of individual 9 is BR or Bb, hecause individual 6 and 7 hoth have genntype Bh, they may produce children with'BB.or Bh who i brown-eyed,
(c) If individual 3 and 4 had
as pany as 8 children, 4 of them would be expected to be blue-eyed. It is because individual 4 is heterozygous (since he
G
has an blue-eyed mother) and individual 5 is homozygous recessive.
Bb
(d) In such combination
of the offspring is
expected to be brown-eyed, and the other half blue-eyed
(e) If individual 9 marries
a blue-eyed man and they produče both blue-eyed and. brown-eyed children, the genotype of individual
should be Hh, since the their blue-eyed children. should receive recessive genes from their mother and father respectively,
If individual 8 marries a brown-eyed woman, the fir first child is blue-eyed, the genotypes of the parente both
because their blue-eyed
child has reveived
recessive genes from lis mother and father
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滑雪 兼 遊埠
BY
F1: BB
Bb
Brown-eyed
Blue-eyed
Té cross it with a lomozygous brown guinea pig. 1. It is homozygous if all
the F1 guinea pigs are packa
BB
(all Black)
It is beterzygous if F1 guinea pigs are black and brown,
Bb
FL:
(Black) (Brown)
1980
中學會考試題預習專欄
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(十六):
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GEOGRAPHY (16)
Y Y. Lee
(MTEL & DALE PRESS LTD.
31.
(a) Musliroom-ahaped pook.
blocks are common in desert: areas. Explain: in brief, their formstion.
(h) Compare and contrast
́zeugén and yardang in
their places of origin u ́outward appearances and
formations,
Suggested Answers:
(a)
In desert areas, wind is the most powerful. agent of f erosion. Winds armed with loads, may abrade or wear down the rock surfaces with which it comes into contact. 3s must of the coarse
materials are transported
only half a metre above
the ground, the power of
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abrasion is most effective
Level. The winds uplifting these materials: as a tool undercut the base of a boulder, which is graduallv. transförmed into a mushroom-shaped blocks can be of gour. The blocks can be of uniform structure, i,e. it is not necessary to have a resistant layer overlying a soft one.
(b) 1) Places or Origin
Both of them are common features found
in desert: area or areas which experienced. clinate for a long time. Outward Appearances:
Both of then are ridge and furrow landscapes, consisting of depressions
—
or furrow's
separated by Kong: block-like ridges. The ridges of zeugen may be as high as 30 mètres. The ridges of yardang may stand up as high as 15 metres.
Formation
Both of them are formed mainly by wind erosion.
For the zeugen, the presence of joints are important in controlling wind erosion, Joints are numerous in the rocks in. arid regions as produced by physical weathering induced by marked diurnal temperature changes. If it so happens that parallel. vertica) joints are found. in rocks which have' a horizontal resistant layer overlies the weaker ones, -wind.
concentrate joints.
abrasion
these joints are further enlarged into long depressions separated by black-like ridges. The ridges have a wide top. because the resistant forms a capping rock protecting the weaker rocks below.
Different from the Zeugens, vardangs are. mainly found in areas where ∙layers of resistant and "soft rocks lie parallel tu
the direction of prevailing wind, Abrasive action will
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he most effectively along
the softer, less-resistant
layers, turning them into
furrows. In between the furrows, the resistant.
band's or racks may stand up asridges
32. Name, the type of coast shown in the sketch ma below. Describe.and account for thre characteristics of this type of coast;
"Suggested Answers:
Type of const
It is a Dalmation cost. which is also known as "a concordant coast or Paci type of coust.
Characterist
ristics
The coastal features are concordant and longitudinal.
coastin sirnight and
Azular. It is an upland coast
where mountain ranges and valleys run parallel to the coast. It is a coast at its youth stage so narîne erosion. is active along åt. It is formed by subaergence. The lowland and valley are downed. by sea water, and the mountain range and peaks stand up as chains of islands or peninsulas. The former valleys become: inlety
sonnds, bays or straits, The- submergency also gives minor
indentation on the coastline: and causes dismember stream system, Coastal slopes are steep The coastal lowland. I's narrow and good sites for harbours" are provided because of deep waters
Examples of balmatian const are the Last Adriatic coast Coast of Yugoslavia, West coast of US A., Chast of · British- Columbia and Peru,
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