Given reasons for the following:
(a) The human testes are located outside the abdominal cavity.
(b) Some organisms like honey-bees are called parthenogenetic animals.
(a) The human testes are located outside the abdominal cavity in a pouch called scrotum. The scrotum helps in maintaining the low temperature of the testes (2 -2.5o C lower than the normal internal body temperature) necessary for spermatogenesis.
(b) Honey bees are parthenogenetic organisms because in them an unfertilized egg develops into a new individual and there is no fertilization. This process of reproduction without fertilization is called parthenogenesis.
How is the entry of only one sperm and not many ensured into an ovum during fertilisation in humans?
Write the name of the following:
(a) The most common species of bees suitable for apiculture
(b) An improved breed of chicken
(a) Where do the signals for parturition originate from in humans?
(b) Why is it important to feed the newborn babies on colostrums?Name the respective pattern of inheritance where F1 phenotype
(a) does not resemble either of the two parents and is in between the two.
(b) resembles only one of the two parents.
