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29 Cards in this Set
- Front
- Back
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How long is oestrus in sheep? |
17 days |
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How long is oestrus in cows, pigs and horses? |
21 days |
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What are signs of oestrus? |
Increased movement/activity Tail head/hair raised Mounting/accepting being mounted Discharge from vulva Vulva reddened, swollen, twitches Reduced feed intake |
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How long are bull sperm viable for? |
30-48 hours |
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Where does fertilisation take place? |
Oviducts |
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Hoe long does fertilisation usually take place in mammals? |
2-4 days |
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When and how many hours do cows ovulate for? |
END of oestrus 10-15 hours |
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When do ewes ovulate? |
Near END of oestrus |
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When do pigs ovulate? |
In the MIDDLE of oestrus |
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How long do cows gestate for? |
282 days |
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How long do sheep gestate for? |
149 days |
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How long do sows gestate for? |
114 days |
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How can twinning occur? |
Due to higher levels if nutrition May be linked to the season Can be induced by hormones |
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Name 4 ways to pregnancy test for cows |
1. Heat detection 2. Progesterone levels 3. Ultrasound scanning 4. Rectal palpation |
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What is a haploid cell? |
A half set of chromosomes (21) |
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What are diploid cells? |
A full set of chromosomes (42) |
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Where can cell division take place? |
All sex cells (gametes) |
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Where do chromosome come from? |
One set comes from the sire via sperm The other from dam via egg |
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What genes? |
Design plans and instruction manuals means by which info can be passed to the next generation |
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How are proteins made? |
Genes carry codes for the production of the proteins |
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What is a locus? |
Site of gene on a chromosome. Mandelin inheritance |
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Describe mendalin inheritance |
It is controlled by one gene Animal will fall into distinct classes eg red vs black |
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What is polygenic inherticance? |
) These genes CANNOT be identified individually- only combined set can be the result Controlled by many genes (can effect growth rate, milk yield)These genes CANNOT be identified individually- only combined set can be the resultAnimals Do not fall into distinct classes - polugenic characteristics show CONTINUOUS VARIATION Animals Do not fall into distinct classes - polugenic characteristics show CONTINUOUS VARIATION |
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What is meant by the term genotype? |
The pair(s) of genes present at one or more loci |
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What is meant by the term phenotype? |
The appearance or observed performance of an animal |
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What is meant by the term homozygote? |
2 copies of the SAME ALLELE at a particular locus Eg Male male Female female |
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What is meant by the term heterozygotes? |
Animals with 2 DIFFERENT alleles Eg Male female |
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What are dominant genes? |
The genes that express themselves which arw powerful. They will outshine recessive genes |
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What is meant by the term recessive? |
Genes which are over shadowed by a dominant gene Recessive genes will only be shown in the absence of a dominant gene |
