Human ancestors who left cave paintings were
Neanderthal man
Cro- magnon man
Java ape man
Peking man
Bull semen is stored in
liquid carbon dioxide
liquid oxygen
liquid nitrogen
ice
C.
liquid nitrogen
Semen is stored in semen banks for artificial insemination or artificial breeding, eg, Bull's semen is stored at -196oC temperature. This temeperature is obtained by liquid nitrogen.
Deep freezing is used for keeping seven day old embryos for several years. Deep freezing is also done at -196oC.
A man of blood group- A marries a woman of blood group- AB, which type of progeny would indicate that man is heterozygous?
O
B
A
AB
Balbiani rings are the structural features of
allosomes
polytene chromosomes
autosomes
lampbrush chromosomes
How many sperm cells are present in an average (3 mL) ejaculation?
200 million
300 million
400 million
500 million
The permanent decrease in population number occurs due to
migration
natality
emigration
mortality
Which of the following is not a vestigial structure in Homo sapiens ?
Third molar
Epiglottis
Plica semilunaris
Pyrimidalis muscle