Polygenic Inheritance – Check Test
1. Which of
the following is an example of discontinuous variation?
A Height in humans
B Tail length in mice
C Tongue rolling in humans
D Weight of pigs
2. A
characteristic which shows a range of differences from
one
extreme to another is said to show
A polygenic variation.
B single – gene inheritance.
C discontinuous variation.
D continuous variation.
3. Single –
gene inheritance is where
A characteristics are controlled by one gene.
B characteristics are controlled by more than
one gene.
C one gene is not enough to control a
characteristic.
D many genes are involved in controlling a
characteristic.
4. If a
characteristic is controlled by the alleles of more than
one gene
the characteristic is said to be
A polygenic.
B continuous.
C discontinuous.
D codominant.
5. Compared
to a characteristic controlled by two genes, a
characteristic
controlled by five genes will have
A the same number of genotypes.
B more different phenotypes.
C fewer different genotypes.
D fewer different phenotypes.
6. A punnett
square is drawn to represent the genotypes in the offspring
of a
cross between two maize plants which each have genotypes for
medium –
red kernels (R1 r1 R2 r2).
R1r1R2r2 x R1r1R2r2
|
M/F |
R1R2 |
R1r2 |
r1R2 |
r1r2 |
|
R1R2 |
|
|
|
|
|
R1r2 |
|
|
Y |
|
|
r1R2 |
|
X |
|
|
|
r1r2 |
|
|
|
|
Which
genotypes should appear at X and Y in the square?
|
|
X |
Y |
|
A |
R1r1R2r2 |
R1r1R2r2 |
|
B |
R1R1R2r2 |
R1R1r2r2 |
|
C |
R1r1R2R2 |
R1r1R2R2 |
|
D |
r1r1R2r2 |
r1r1R2R2 |
7. Which of
the following is NOT an example of polygenic inheritance?
A Height in humans
B Tail length in mice
C Hand span in humans
D Coat colour in horses
8. Which line in the table is correct when
referring to single – gene inheritance?
|
|
Number of genes controlling a characteristic |
Type of variation |
|
A |
1 |
continuous |
|
B |
2 |
continuous |
|
C |
1 |
discontinuous |
|
D |
2 |
discontinuous |