Which of the following most appropriately describes haemophilia?
A) Dominant gene disorder B) Chromosomal disorder C) X-linked recessive gene disorder D) Recessive gene disorder Answer:C) X-linked recessive gene... View Article
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Pick out the incorrect statement for diseases given
A) Down’s syndrome is due to aneuploidy B) Haemophilia is a sexlinked recessive disease C) Sickle cell anaemia is an... View Article
A cell at telophase stage is observed by a student in a plant brought from the field. He tells his teacher that this cell is not like other cells at telophase stage. There is no formation of cell plate and thus the cell is containing more number of chromosomes as compared to other dividing cells. This would result in
A) polyteny B) somaclonal variation C) polyploidy D) aneuploidy Answer:C) polyploidy Explanation: Polyploidy refers to the condition, where the full... View Article
Among the following characters, which one was not considered by Mendel in his experiments on pea?
A) Seed colour – Green or yellow B) Trichomes – Glandular or non glandular C) Stem height – Tall or... View Article
What Does The Survival Factor Do?
Basically, survival factors inhibit apoptosis in particular tissues. These factors bind to the cell-surface receptors thereby initiating intracellular signalling pathways... View Article
What Are Survival Factors?
Most animal cells comprise the molecular machinery essential for apoptosis and hence are ready to self destruct. Whether alive or... View Article
How Would You Justify That Growth And Division Are Coordinated By Multiple Mechanisms In Animal Cells?
In animal cells, the coordination of division and growth is obtained by many combinations of the generally occurring mechanisms. Division,... View Article
Is Yeast Cell Size Constant?
Yeast cell size is not always constant: small changes in the average size of cells in a population can occur... View Article
How Is It Evident That Robust Mechanisms Are Present In Yeasts Which Coordinate For Cell Division And Growth?
Yeast cells can encounter sudden large changes in the levels of nutrients in their environment— and should instantly respond with... View Article
How Is Protein Synthesis A Major Determinant Of Cell Growth?
Several eukaryotic cells can adjust their rate of growth responding to changes in different regulatory factors, which include the concentration... View Article
What Happens In Cell Growth?
Cell growth is the phenomena wherein a cell increases its size by synthesizing the proteins, membranes, organelles and other components... View Article
What Governs The Rate Of Cell Division?
The rate of cell division is governed by a combination of intracellular and extracellular factors. Yeast proliferation is limited primarily... View Article
What Happens To The Haploid Nuclei After Meiosis II?
After meiosis II, haploid nuclei are packaged into cells that differentiate into specialized cell types, such as spores in yeast... View Article
Which Event Occurs Mitosis And Should Never Occur After Meiosis I?
DNA synthesis is a vital event that must take place after mitosis, however, must never occur after meiosis I. Robust... View Article
What Are The Mechanisms Driving Completion Of Meiosis I Related To?
The mechanisms driving the completion of meiosis I is related to but distinct from those controlling the completion of mitosis.... View Article
What Follows The Separation Of Homologs In The First Meiotic Division?
The separation of the homologs in the first meiotic division is immediately followed by entry into meiosis II. As in... View Article
What Opposes The Pulling Forces Of The Meiotic Spindle In Metaphase I?
The pulling forces of the meiotic spindle at metaphase I are opposed only by sister-chromatid arm cohesion distal to the... View Article
What Is Crossover Interference?
It is the ability of one crossover to suppress the formation of other crossovers in the vicinity. It could facilitate... View Article
What Does Effective Homolog Linkage Depend On?
Effective homolog linkage depends on the positioning of chiasmata along the chromosomes. If homologs are linked by a single chiasma... View Article
What Does Correct Chromosome Alignment In Meiosis I Require?
Accurate chromosome alignment in meiosis I require connections between homolog pairs. In most species, this linkage depends on the chiasmata... View Article
