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ngeyammm >.< > genetics 2 > Flashcards

genetics 2 Flashcards

1
Q

is a consequence of one or two breaks and the loss of a chromosome segment, and may be either terminal or intercalary.

A

chromosomal deletion

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2
Q

occurs when there is a break and the loss of the terminal segment or two breaks and the reunion of the broken ends to form a ring.

A

terminal deletion

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3
Q

involve the loss of a chromosome segment between two breaks.

A

intercalary

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4
Q

involve addition of an extra segment to a chromosome, through abnormal replication or unequal crossing over in meiotic cells of the parent

A

duplication

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5
Q

this are less harmful and more common than deletions

A

duoplications

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6
Q

involves two breaks on a chromosome and the rotation of the broken segment prior to reunion of the broken ends, resulting in the reversal of a gene sequence.

A

inversion

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7
Q

in paracentric inversion, the centromere is included in the inverted segment, but for a pericentric inversion the centromere is not involved and is confined to one arm of the chromosome only

A

pericentric
paracentric

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8
Q

represent misdivision of the centromere and are always metacentric with identical but reversed gene sequence.

A

isochromes

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9
Q

Translocation occurs when a portion of one chromosome is attached to a homologous chromosome.

A

nonhomologous

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10
Q

is a result of an exchange between a segment of one chromosome and a segment of another chromosome

A

reciprocal translocation

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11
Q

reciprocal translocation is common in domestic animals

A

naur

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12
Q

A high incidence of ab.. normal spermatozoa observed are found to be linked with ___ in mammals

A

testicular hypoplasia

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13
Q

knobbed acrosome in bulls is dominant while recessive in boars

A

baliktad

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14
Q

inherites sperm defects causing sterility

A

knobbed sperm
decapitated
pseudodroplet
sterilizing tail stump

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15
Q

inherited sperm defects causing infertility

A

dag defect
corkscrew
diadem effects

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16
Q

A type of impotency has been reported among__ bulls in which they are unable to extend the Sigmoid curve of the penis during erection;

A

Friesian

17
Q

wolffian duct aplasia is hereditary

A

t

18
Q

malformation leading to impotency like persistence of the penile frenulum is experienced in what breed?

retroversion of the penis on the other hand is xp in __

A

Aberdeen Angus and Short… horns,
Chianina bulls

19
Q

Testes of subnormal size which exhibit inadequate growth and development are con… sidered as

A

hypoplastic

20
Q

Stenosis of the epididymis generally has a higher incidence i

A

buck
rams
bulls

21
Q

Testicular hypoplasia is commonly found in

A

cattle, goat,pigs

22
Q

commonest type of defective differentiation of the male genital system and is very common in pigs, goats, and horses, and occasionally occurs in cattle

A

crypto

23
Q

cryptorchidism is inherited in?

A

pigs

24
Q

Bilateral cryptorchidism has been reported in__ and in some _ bulls

A

Shorthorns
Hereford

25
Q

abnormality:animal affected: mode of inheritance: reproductive problem

sperm defects: ___: ___: ___
testicular hypoplasia: ___: ____: ___
ovarian hypoplasia: ___: ____: ___
cryptorchidism : ___: ____: ___
cystic ovaries: ___: ____: ___
defects of mullerian duct system : ___: ____: ___

A

sperm defects: bull, boar: inherited: infertility
testicular hypoplasia: bull: Recessive autosomal gene with incomplete penetrance: Sterility/Infertility

ovarian hypoplasia: cow
cryptorchidism : boar,stallion: sex limited: disturbance in spermatogenesis
cystic ovaries: cow: polygenic trait : anestrus/nyphomania
defects of mullerian duct system : cow : single recessive sex limited : sterility

26
Q

is a common cause of infertility in dairy cows

A

cystic ovaries

27
Q

cystic ovaries is associated with an increase in__ production and a reduction in the __ concentration.

A

FSH
LH

28
Q

This condition is inherited as a polygenic trait in cattle

A

cystic ovaries

29
Q

An example of abnormal development to Mullerian ducts is the __ of the duct system which occurs in all farm animals

A

segmental aplasia

30
Q

species affected with robertsonian translocation

A

cattle

31
Q

mosaic abberation due to repated breeding is common

A

cattle

ngeyammm >.< (9 decks)

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