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.

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

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 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

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

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

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

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