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Heredity/codominance 9
Test Description: This game aims to review different important definitions used in the heedity course for Grade 9 students.
Instructions: Answer all questions to get your test result.
1) Test cross is a cross:
A
Made to determine the unknown genotype of the dominant allele.
B
Between F1 themselves
C
All choices are correct
D
Made to determine the unknown genotype of the recessive allele.
2) Self cross is a cross between :
A
Made to determine the unknown genotype of the dominant allele.
B
F1 cross birecessive
C
Two birecessive
D
F1 cross F1
3) A cross between white fur rabbit(pure) and black fur rabbit(pure) gives 100% white rabbits spotted with black (F1) :
A
This is the case of codominance
B
This is the case of Complete dominancy
C
White allele dominates the black
D
Black allele dominates the white one
4) In case of codominance:
A
The recessive allele masks the dominant one
B
Both alleles are recessive.
C
The dominant allele masks the recessive one
5) A cross between white flower (pure) and red flower (pure) gives 100% F1 (whiteflowers spotted with red):
A
W: is the symbol of white flower allele
B
All choices are correct
C
R: is the symbol of red flower allele
D
This is the case of codominance
6) A cross between a fish with red scales(pure) with a fish having blue scales gives 100%fish of blue and red scales. The symbols that may be used are:
A
R: red B:blue
B
r : red B: blue
C
R : red b: blue
D
r : red B: blue
7) Pure genotype (meaning/examples):
A
AA
B
All choices are correct
C
Homozygous
D
bb
8) A cross between pure red flower and white spotted with red gives: (Codominance case)
A
100% pure red
B
None of the above choices
C
50 % redspotted white and 50% white spotted with red
D
50% red and 50% white
9) A cross between white flower spotted with red with another white flower spotted with red gives: ( Codominance case)
A
50% white spotted with red, 25% red , 25% white flowers
B
50% white and 50% red flowers
C
100% red flowers
D
100% white flowers
10) A man of blood group A (pure) and his wife of blood group B( pure) may give a child having
A
Blood group (AB) only
B
Non of the choices is correct
C
Blood group B
D
Blood group A
*select an answer for all questions
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