genetics 2

Question 1

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

Answer 1

chromosomal deletion

Question 2

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.

Answer 2

terminal deletion

Question 3

involve the loss of a chromosome segment between two breaks.

Answer 3

intercalary

Question 4

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

Answer 4

duplication

Question 5

this are less harmful and more common than deletions

Answer 5

duoplications

Question 6

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.

Answer 6

inversion

Question 7

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

Answer 7

pericentric
paracentric

Question 8

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

Answer 8

isochromes

Question 9

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

Answer 9

nonhomologous

Question 10

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

Answer 10

reciprocal translocation

Question 11

reciprocal translocation is common in domestic animals

Answer 11

naur

Question 12

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

Answer 12

testicular hypoplasia

Question 13

knobbed acrosome in bulls is dominant while recessive in boars

Answer 13

baliktad

Question 14

inherites sperm defects causing sterility

Answer 14

knobbed sperm
decapitated
pseudodroplet
sterilizing tail stump

Question 15

inherited sperm defects causing infertility

Answer 15

dag defect
corkscrew
diadem effects

Question 16

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

Answer 16

Friesian

Question 17

wolffian duct aplasia is hereditary

Answer 17

t

Question 18

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 __

Answer 18

Aberdeen Angus and Short… horns,
Chianina bulls

Question 19

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

Answer 19

hypoplastic

Question 20

Stenosis of the epididymis generally has a higher incidence i

Answer 20

buck
rams
bulls

Question 21

Testicular hypoplasia is commonly found in

Answer 21

cattle, goat,pigs

Question 22

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

Answer 22

crypto

Question 23

cryptorchidism is inherited in?

Answer 23

pigs

Question 24

Bilateral cryptorchidism has been reported in__ and in some _ bulls

Answer 24

Shorthorns
Hereford

Question 25

abnormality:animal affected: mode of inheritance: reproductive problem sperm defects: ___: ___: ___ testicular hypoplasia: ___: ____: ___ ovarian hypoplasia: ___: ____: ___ cryptorchidism : ___: ____: ___ cystic ovaries: ___: ____: ___ defects of mullerian duct system : ___: ____: ___

Answer 25

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

Question 26

is a common cause of infertility in dairy cows

Answer 26

cystic ovaries

Question 27

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

Answer 27

FSH LH

Question 28

This condition is inherited as a polygenic trait in cattle

Answer 28

cystic ovaries

Question 29

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

Answer 29

segmental aplasia

Question 30

species affected with robertsonian translocation

Answer 30

cattle

Question 31

mosaic abberation due to repated breeding is common

Answer 31

cattle