Updated...

Hello all, I have been reading on the internet regarding cat genes and I now know some really interesting facts!!

The boring stuff :-

- Genectic makeup of a cat is contained on 19 pairs of chromosome. One chromosome from each pair is from "Mama", the other from "Papa".

- Each chromosome is also known as DNA

- The sperm has 19 chromosomes and the egg contains 19 chromosomes, both finds one another to become matching 19 pairs of chromosone (unique), the full compliment needed for a cat.


The interesting stuff :-

-In case of hair length, in most cases, short hair is dominant over long hair!
A cat need two copies of long hair allele to have long hair.

e.g. If the kitten gets a short hair allele from one parent and long hair allele from the other, the short hair will become dominant. Kitten is very likely to be short haired.
However, cats with one copy of long hair allele can pass it one to her / his offspring. Cat A = short-hair with one copy of long hair allele

Cat A when mated with another DSH (with recessive long hair allele), there is a 25% possibility of kittens with long hair, and 50% will have short hair but carry the long hair allele.

Cat A when mated with another DSH (without recessive long hair allele), kittens are all likely to be short haired, but 50% will carry the long hair allele.

Cat A when mated with another DLH, there is a 50% possibility of kittens with long hair. 50% will have short hair but carry long hair allele.

e.g. A DLH female mates with a DSH male (with no recessive long hair allele), very likely to produce short hair offsprings!

- Males control the sex of offspring.

- Most tortie are females. Tortie boys are rare and has a gene malformation. Tortie boys are almost, always sterile (mandul...i think that's the word)

- Orange colouring are only inherited from a female cat. Meaning that an orange male cat can't have orange kittens unless his mates are carrying the orange gene. (As such, if your kittens are orange but the mom is tortie, don't think that the father cat is "ORANGE"!! Tortie normally has orange gene.)

So, before you start breeding cats, do a little research on cat's genes!!!! (I know of some expecting a DLH to produce DLH kittens by allowing it to mate with any tom, dick and harry out there!)

Good info Bina..keep it up!!

__________________
"In the beginning, God created man, but seeing him so feeble, He gave him the cat."
- Warren Eckstein

i like the spirit of your post. discouraging irresponsible breeding is good. but just thought you'd like to know that dominance is not perfect and we have had short haired cats produce very long haired kittens. i think that info has to be as accurate as possible of else, the potential breeders will keep on going. furthermore, hair length can be a mediated gene ie. long hair x short hair can yield medium hair kittens

__________________
Alicia Ling Horsley

Pet Epicure
We feed our pets PINK raw food
Feral Friend Malaysia


"The hottest places in hell are reserved for those who, in time of great moral crisis, maintain their neutrality."Dante

[QUOTE=bina- Males control the sex of offspring.


[/QUOTE]


all animals, the male gametes will determine the sex of the offspring.

Thanks Alicia, but my facts are general ones... I am not that good in biology! If anyone can add in on the facts, that will be greaaaaaaatt!

Giving "male species" the respect they deserve mah... so I mention loh!

Zarul,can you elaborate?? I'm not very clear on this. what do u mean by male gametes will determine the sex of the offspring??

Saya tak pasti mengapa alicia mengatakan bahawa dominant tidak sempurna.

organisma dengan kedua-dua gen dominant kita panggil homozegus
organisma dengan 1 gen dominant dan 1 gen resesif kita panggil heterozegus

kita ambil contoh warna mata

copper adalah warna dominan (C)
biru/hijau adalah warna resesif (c)

katakan saya mempunyai kucing jantan mata berwarna copper. ada dua kemingkinan. samada kucing tersebut homozegus atau heterozegus.

kucing betina saya bermata biru. biru adalah resesif .untuk warna biru ditonjolkan kucing tersebut perlu mempunyai dua gen resesif.

jika kucing jantan saya homozegus, bila ianya mengawan dengan kucing betina saya, kesemua anaknya akan mempunyai mata berwarna copper kerana setiap anak akan mendapat gen warna copper dari kucing jantan tersebut.


Kucing jantan (CC)
semua sperma yang dihasilkan adalah membawa gen C

kucing betina (cc)
semua ovum yang dihasilkan membawa gen c

semua anak akan mempunyai gen Cc

anak2 ini kita panggil heterozeguz
mempunyai warna mata copper tetapi
membawa i gen dominan (C) dan satu
gen resesif (C)



Jika kucing jantan saya heterozegus


Kucing jantan (Cc)
sperma yang dihasilkan adalah dua jenis satu membawa gen C dan satu membawa gen c

kucing betina (cc)
semua ovum yang dihasilkan membawa gen c

Jika sperma C mensenyawa ovum c anak yang terhasil
adalah bermata copper heterozegus (Cc)

Jika sperma c mensenyawakan ovum c anak yang terhasil
adalah bermata biru homozegus resesif (cc)

ok

jantina ditentukan oleh kromosom sex. kromosom sex ada 2 jenis X dan Y

Kromosom sex untuk kucing betina adalah XX
jadi semua ovum yg terhasil adalah dari jenis X

kromosomsex untuk kucing jantan adalah XY
sperma yang dihasilkan oleh kucing jantan adalah X dan Y

jika sperma X mensenyawakan ovum X anak tersebut adalah betina

jika sperma Y mensenyawakan ovum X anak tersebut adalah jantan

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