Heredity/codominance 9 Question Preview (ID: 51349)
This Game Aims To Review Different Important Definitions Used In The Heedity Course For Grade 9 Students.
TEACHERS: click here for quick copy question ID numbers.
Test cross is a cross:
a) Made to determine the unknown genotype of the dominant allele.
b) Between F1 themselves
c) Made to determine the unknown genotype of the recessive allele.
d) All choices are correct
Self cross is a cross between :
a) F1 cross birecessive
b) F1 cross F1
c) Two birecessive
d) Made to determine the unknown genotype of the dominant allele.
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 Complete dominancy
b) Black allele dominates the white one
c) White allele dominates the black
d) This is the case of codominance
In case of codominance:
a) The dominant allele masks the recessive one
b) The recessive allele masks the dominant one
c) Both alleles are recessive.
d)
A cross between white flower (pure) and red flower (pure) gives 100% F1 (whiteflowers spotted with red):
a) This is the case of codominance
b) R: is the symbol of red flower allele
c) W: is the symbol of white flower allele
d) All choices are correct
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
Pure genotype (meaning/examples):
a) Homozygous
b) AA
c) bb
d) All choices are correct
A cross between pure red flower and white spotted with red gives: (Codominance case)
a) 50 % redspotted white and 50% white spotted with red
b) 100% pure red
c) 50% red and 50% white
d) None of the above choices
A cross between white flower spotted with red with another white flower spotted with red gives: ( Codominance case)
a) 100% red flowers
b) 100% white flowers
c) 50% white and 50% red flowers
d) 50% white spotted with red, 25% red , 25% white flowers
A man of blood group A (pure) and his wife of blood group B( pure) may give a child having
a) Blood group A
b) Blood group B
c) Blood group (AB) only
d) Non of the choices is correct
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