Double Sex-Linked Recessive Inheritance
The concept of combining 2 Sex-Linked Recessive traits is
more complex to follow and to understand than a simple single Sex-Linked
Recessive Trait. The key is to make punnett squares so you can follow the
different crosses easily. While there aren't many instances where combining
these two modes of inheritance is necessary, there are a few examples of this
in cage birds such as combining the Lutino and Pearl traits in Cockatiels.
*Remember for Sex-Linked
ZZ = Male
ZW = Female
ZQ = Normal form of the Lutino Gene (dominant)
Zq = Lutino form of the lutino Gene (recessive)
ZN = Normal form of the Pearl Gene (dominant)
Zn = Pearl form of the Pearl Gene (recessive)
Legend of all possible genetic combinations
***Note. It is common practice to include both genes on the
same Z chromosome****
For Instance: ZQNZQN
= Normal Male
ZQNZQN = Normal
Male
ZQNZqn = Split to Pearl/Split to Lutino Male
ZQNZQn = Split to Pearl Male
ZQNZqN = Split to Lutino Male
ZqN ZqN = Lutino Male
ZQnZQn = Pearl Male
ZQnZqn = Pearl Split to Lutino Male
ZqNZqn = Lutino Split to Pearl Male
ZqnZqn = Lutino Pearl Male
ZQNW = Normal Female
ZqNW = Lutino Female
ZQnW = Pearl Female
ZqnW = Lutino Pearl Female
Possible Crosses:
1) Normal Male x Normal Female OR Normal Female x Normal
Male = All Normal Offspring
W ZQN ZQNZQN
ZQN ZQNW
2) Normal Male x Pearl Female = 50% Split to Pearl Males
& 50% Normal Females
ZQNZQn ZQNW ZQNZQn ZQNW
Normal Female x Pearl Male = 50% Split to Pearl Males & 50% Pearl Females
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ZQN |
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ZQNZQn |
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ZQn |
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ZQnW |
3) Normal Male x Lutino Female = 50% Split to Lutino Males
& 50% Normal Females
ZQNZqN
Normal Female x Lutino Male = 50% Split to Lutino Males
& 50% Lutino Females
ZqN ZqN
4) Normal Male x Lutino Pearl Female = 50% Split to
Lutino/Split to Pearl Males & 50% Normal Females
Zqn ZQN
Normal Female x Lutino Pearl Male = 50% Split to
Lutino/Split to Pearl Males & 50% Lutino Pearl Females
Zqn
5) Split to Lutino Male x Normal Female = 25% Normal Males, 25% Split to Lutino Males, 25% Normal Females, & 25% Lutino Females
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ZQN |
W |
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ZQNW |
ZqN |
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6) Split to Lutino Male x Pearl Female = 25% Split to Pearl
Males, 25% Split to Lutino/Split to Pearl Males, 25% Normal Females, & 25%
Lutino Females
ZQn
ZQNZQn ZqN ZqNZQn ZqNW
7) Split to Lutino Male x Lutino Female = 25% Split to
Lutino Males, 25% Lutino Males, 25% Normal Females, & 25% Lutino Females
ZqN W ZQNW ZqN
8) Split to Lutino Male x Lutino Pearl Female = 25% Lutino
Split to Pearl Males, 25% Split to Lutino/Split to Pearl Males, 25% Normal
Females, & 25% Lutino Females
ZQN ZQNZqn ZQNW ZqN ZqNZqn ZqNW
9) Split to Pearl Male x Normal Female = 25% Normal Males, 25% Split to Pearl Males, 25% Normal Females, 25% Pearl Females
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ZQN |
W |
ZQN |
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ZQNZQn |
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10) Split to Pearl Male x Pearl Female = 25% Pearl Males,
25% Split to Pearl Males, 25% Normal Females, 25% Pearl Females
W ZQNZQn
11) Split to Pearl Male x Lutino Female = 25% Split to
Lutino Males, 25% Split to Pearl/Split to Lutino Males, 25% Normal Females, 25%
Pearl Females
12) Split to Pearl Male x Lutino Pearl Female = 25% Pearl
Split to Lutino Males, 25% Split to Pearl/Split to Lutino Males, 25% Normal
Females, 25% Pearl Females
Zqn ZQN ZQNZqn ZQNW ZQn ZQnZqn ZQnW
13) Split to Pearl/Split to Lutino Male x Normal Female =
12.5% Normal Males, 12.5% Split to Pearl Males, 12.5% Split to Lutino Males,
12.5% Split to Lutino/Split to Pearl Males, 12.5% Normal Females, 12.5% Pearl
Females, 12.5% Lutino Females, & 12.5% Lutino Pearl Females
ZQN W ZQN ZQNW ZQn ZQnW ZqN ZQNZqN Zqn ZqnW
14) Split to Pearl/Split to Lutino Male x Pearl Female =
12.5% Split to Pearl Males, 12.5% Pearl Split to Lutino Males, 12.5% Pearl
Males, 12.5% Split to Lutino/Split to Pearl Males, 12.5% Normal Females, 12.5%
Pearl Females, 12.5% Lutino Females, & 12.5% Lutino Pearl Females
ZQn ZQN ZQNW ZQn ZQnZQn ZQnW ZqN ZqNZQn Zqn
15) Split to Pearl/Split to Lutino Male x Lutino Female =
12.5% Split to Lutino Males, 12.5% Lutino Split to Pearl Males, 12.5% Lutino
Males, 12.5% Split to Lutino/Split to Pearl Males, 12.5% Normal Females, 12.5%
Pearl Females, 12.5% Lutino Females, & 12.5% Lutino Pearl Females
ZqN W ZQN ZQNZqN ZQNW ZQn ZqNZQn ZqN ZqNZqN Zqn ZqnW
16) Split to Pearl/Split to Lutino Male x Lutino Pearl
Female = 12.5% Pearl Split to Lutino Males, 12.5% Lutino Split to Pearl Males,
12.5% Lutino Pearl Males, 12.5% Split to Lutino/Split to Pearl Males, 12.5%
Normal Females, 12.5% Pearl Females, 12.5% Lutino Females, & 12.5% Lutino
Pearl Females
Zqn W ZQN ZQn ZQnW ZqN Zqn ZqnZqn
17) Pearl Split to Lutino Male x Normal Female = 25% Split
to Pearl Males, 25% Split to Lutino/Split to Pearl Males, 25% Pearl Females,
& 25% Lutino Pearl Females
ZQnW Zqn ZqnW
18) Pearl Split to Lutino Male x Pearl Female = 25% Pearl
Males, 25% Pearl Split to Lutino Males, 25% Pearl Females, & 25% Lutino
Pearl Females
ZQn ZQn ZQnZQn ZQnW ZQnZqn
19) Pearl Split to Lutino Male x Lutino Female = 25% Lutino
Split to Pearl Males, 25% Split to Pearl/Split to Lutino Males, 25% Pearl
Females, & 25% Lutino Pearl Females
ZqNZQn ZQnW ZqNZqn
20) Pearl Split to Lutino Male x Lutino Pearl Female = 25%
Pearl Split to Lutino Males, 25% Lutino Pearl Males, 25% Pearl Females, &
25% Lutino Pearl Females
Zqn W ZQn ZQnZqn ZQnW Zqn
21) Lutino Split to Pearl Male x Normal Female = 25% Split
to Lutino Males, 25% Split to Lutino/Split to Pearl Males, 25% Lutino Females,
& 25% Lutino Pearl Females
ZQNZqN Zqn
22) Lutino Split to Pearl Male x Pearl Female = 25% Pearl
Split to Lutino Males, 25% Split to Lutino/Split to Pearl Males, 25% Lutino
Females, & 25% Lutino Pearl Females
ZQn ZQnZqn
23) Lutino Split to Pearl Male x Lutino Female = 25% Lutino
Males, 25% Lutino Split to Pearl Males, 25% Lutino Females, & 25% Lutino
Pearl Females
ZqN ZqNW
24) Lutino Split to Pearl Male x Lutino Pearl Female = 25%
Lutino Pearl Males, 25% Lutino Split to Pearl Males, 25% Lutino Females, &
25% Lutino Pearl Females
W ZqN ZqNZqn ZqnZqn ZqnW
25) Lutino Pearl Female x Normal Male = 50% Split to
Lutino/Split to Pearl Males & 50% Normal Females
ZQNZqn
Lutino Pearl Male x Normal Female = 50% Split to
Lutino/Split to Pearl Males & 50% Lutino Pearl Females
ZQN Zqn ZQNZqn ZqnW Zqn ZQNZqn ZqnW
26) Lutino Pearl Male x Lutino Female = 50% Lutino Split to
Pearl Males & 50% Lutino Pearl Females
Zqn ZqNZqn Zqn
Lutino Pearl Female x Lutino Male = 50% Lutino Split to
Pearl Males & 50% Lutino Females
Zqn ZqNZqn ZqNW ZqNZqn
27) Lutino Pearl Male x Pearl Female = 50% Pearl Split to
Lutino Males & 50% Lutino Pearl Females
ZQn Zqn ZqnW Zqn ZqnW
Lutino Pearl Female x Pearl Male = 50% Pearl Split to Lutino
Males & 50% Pearl Females
W ZQn ZQnW
28) Lutino Pearl Male x Lutino Pearl Female = 100% Lutino
Pearl Chicks
W ZqnW
Lutino Pearl Female x Lutino
Pearl Male = 100% Lutino Pearl Chicks
W Zqn ZqnW