Home
Class 12
BIOLOGY
The nuclear structure observed by Henkin...

The nuclear structure observed by Henking in 50% of the insect sperm after spermatogenesis was:

A

X body

B

autosome

C

Y-chromosome

D

nucleolus

Text Solution

Verified by Experts

Promotional Banner

Topper's Solved these Questions

  • MODEL QUESTION PAPER 5

    SARAS PUBLICATION|Exercise EXERCISE|88 Videos
  • Model Solved Paper 2020 (3)

    SARAS PUBLICATION|Exercise EXERCISE|39 Videos

Similar Questions

Explore conceptually related problems

A certain radioactive material is known to decay at a rate proportional to the amount present. If initially there is 50 kg of the material present and after two hours it is observed that the material has lost 10% of its original mass, find () and expression for the mass of the material remaining at any time t, (ii) the mass of the material after four hours and (iii) the time at which the material has decayed to one half of its initial mass.

A certain radioactive material is known to decay at a rate proportional to the amount present. If initially there is 50 kg of the material present and after two hours it is observed that the material has lost 10% of its original mass, find () and expression for the mass of the material remaining at any time t, (ii) the mass of the material after four hours and (iii) the time at which the material has decayed to one half of its initial mass.

A scientist was studying the production of a protein that was released by an animal cell into a culture medium, she found that the protein only appeared in the culture medium after the added a few drops of a hormone to the cell. Before adding the hormone, she labelled the protein inside the cell with a fluorescent dye and looked at the cell under the lgiht microscope. The dye was seen in flattened sheets and tube. like structures throughout the cell, and in stacks of flattened sac-like structures. after adding the hormone, the dye was aslo seen as small dots clustered against the cell membrane, Which statement most likely explains these observations?

Consider the following statements. (i) Polyspermy may bring about fertilisation of egg by more than one male nucleus or the supernumerary sperms may fertilise other components of embryo sac much as synergids or antipodals. (ii) In angiosperms, pollen tube is normally an unbranched structure which ususally persists after fertilisation. (iii) Intine is the inner, pectocellulosic layer of pollen grain wall which is destroyed during acetolysis. (iv) Exine layer of pollen grain comprises of an outer non-sculptured layer sexine and an inner sculptured layer tectum. Which of the following combinations of above given statements is correct ?

a. When and where does spermatogenesis in a human male begin to take place? b. With the help of schematic labelled diagrams, trace the development of mature spermatozoa in a human male? c. Describe the structure of a human sperm.

1. Muscle - (i) Myofibrils 2. Rod structure - (ii) 40-50% of body weight 3. Connective tissue - (iii) Tendon 4. Collagen fibres - (iv) Epimysium