what would a white leghorn x rir look like?

[nicalandia]

I just coined the term double sex linked since a single z chromosome is carrying two sex linked traits/genes, if a single z is carrying 3 sex linked genes then i'd call it triple sex linked or multiple sex linked if the case may be and just identify which sex linked mutations there are.

This naming convention helps me identify and differentiate for example a rooster that is ZB ZS vs another rooster that is ZBS Z+; both roosters will have similar phenotypes but their Z chromosomes are different. When the two roosters are bred they will produce different outcomes.

For example, when a ZB ZS roo is mated to ...using the punnett square, ZB and ZS will separate while in the double sex linked, ZBS Z+, based on the punnett square, the two Z chromosomes will separate as ZBS and Z+

So for me, calling a rooster double sex linked for barring and silver, means the pair of z sex chromosomes is ZBS Z+ . For the hen if she is silver barred at the same time then there is only one possiblity, ZBS double linked, since hens only have one Z chromosome.

This rooster below is double sex linked silver barred ZSB Z+ not ZS ZB.View attachment 2879272
Maybe this discussion regarding the the difference between a ZSB Z+ vs ZS ZB should be in a different thread. ZSB ZSB, ZS ZB, ZSB Z+, ZSB ZS, ZSB ZB.

But you are not taking into account the frequent crossing over at meiosis and since Silver and Barring are not linked to each other they will segregate independently.

Female offspring of those double sex linked males could be ZBs+/- and Zb+S/- and ZBS/-

 

[Pinoy Angelfish]

But you are not taking into account the frequent crossing over at meiosis and since Silver and Barring are not linked to each other they will segregate independently.

View attachment 2879726


Female offspring of those double sex linked males could be ZBs+/- and Zb+S/- and ZBS/-

Hi nic, i continued this discussion at https://www.backyardchickens.com/th...-zs-zsb-zb-and-zsb-zsb.1499051/#post-25047415

 

[BroodyBambi]

These juveniles are from a RIR rooster over a white Leghorn hen.



Same two birds in the forground.

Do your hens still lay just white eggs?