Which one of. the following animals possesses giant chromosome?
Drosophila
Mouse
Pigeon
Elephant
A.
Drosophila
Polytene chromosomes or salivary chromosomes are the giant chromosomes discovered by Balbiani (1881) in the salivary glands of Chironomous tantans. Later they were found in the salivary glands and Malpighian tubules) of many insect larvae including Drosophila.
Presence of which of the following hormone in the urine confirms pregnancy?
Progesterone
Oestrogen
Human chorionic gonadotropin
Prolactin
In plant tissue culture, the callus tissues can be regenerated into complete plantlets primarily by altering the concentration of
sugars
vitamins
amino acids
hormones
If you want to develop hybrid seeds within a bisexual flower, the following part needs to be removed from the same flower
stigma
ovary
anther
oviduct
Basic principle of developing transgenic plants and animals is to introduce the gene of interest into the nucleus of
somatic cell
vegetative cell
germ cell
body cell
Which pairs of the following diseases are caused by two genes located on human X-chromosomes?
Colour blindness and phenylketonuria
Colour blindness and haemophilia
Colour blindness and albinism
Colour blindness and hypertrichosis
