Write About The Occurrence Of Homologous Recombination.
Double-strand breaks are introduced at many instances along the chromosomes, and single-stranded DNA segments developing at these breaks interact with... View Article
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Does Meiosis Cause The Separation Of Homologous Chromosomes?
The special attribute of meiosis is that it leads not only to the segregation of sister chromatids but to the... View Article
Thalassemia and sickle cell anaemia are caused due to a problem in globin molecule synthesis select the correct statement
A. Both are due to a quantitative defect in globulin chain synthesis B. Thalassemia is due to less synthesis of... View Article
Thalassemia and sickle cell anaemia are caused due to a problem in globin molecule synthesis. Select the correct statement
A) Thalassemia is due to less synthesis of globin molecules B) Both are due to a quantitative defect in globin... View Article
How is the sex-determination mechanism different in the birds?
Birds show female heterogamety, i.e. the females have different types of chromosomes and are responsible for sex determination. Males have... View Article
Can you tell which of the characters in the pairs yellow/green colour and round/wrinkled shape was dominant?
Yellow/green are the contrasting traits of seed colour and round/wrinkled are the contrasting traits of seed shape of the pea... View Article
What is the nature of offspring of a test cross?
In the test cross, the dominant phenotype whose genotype is to be determined is test crossed with the recessive phenotype.... View Article
Mendel self-pollinated the F2 plants and found that dwarf F2 plants continued to generate dwarf plants in F3 and F4 generations. What do you think he would have got had he self-pollinated a tall F2 plant?
When we cross homozygous tall (TT) and dwarf plants (tt), in the F1 generation, we get all the tall plants... View Article
What would be the phenotype of a plant that had a genotype Tt?
The phenotype of a plant with the genotype Tt would be tall. Here tallness (T) is a dominant trait over... View Article
What do you think the doctors inject to induce delivery?
Doctors inject oxytocin to induce labour pain and delivery. Oxytocin is released by the posterior pituitary in response to the... View Article
Do you know for how many months pregnancy last in dogs, elephants, cats?
In human beings, pregnancy lasts for around 9 months. It is called the gestation period, i.e. the period of embryonic... View Article
How many sperms are formed from a secondary spermatocyte?
A) 1 B) 4 C) 2 D) 8 Answer: C) 2 Explanation: Sperms are produced by the process of spermatogenesis from... View Article
Gonads develop from embryonic
A) mesoderm B) ectoderm C) ectoderm and mesoderm D) endoderm Answer: A) mesoderm Explanation: The inner cell mass differentiates into three... View Article
Location and secretion of Leydig’s cells are
A) ovary – estrogen B) liver – cholesterol C) pancreas – glucagon D) testis – testosterone Answer: D) testis – testosterone... View Article
Eye lens is formed from
A) mesoderm B) ectoderm C) ectoderm and mesoderm D) endoderm Answer: B) ectoderm Explanation: The inner cell mass differentiates into three... View Article
The mammalian corpus luteum produces
A) luteinizing hormone B) luteotrophic hormone C) progesterone D) estrogen Answer: C) progesterone Explanation: Corpus luteum secretes progesterone, which helps in... View Article
Fertilizin is a chemical substance produced from
A) middle piece of sperm B) polar bodies C) acrosome D) mature eggs Answer: D) mature eggs Explanation: Fertilizin is a... View Article
After ovulation Graafian follicle regresses into
A) corpus callosum B) corpus artesia C) corpus albicans D) corpus luteum Answer: D) corpus luteum Explanation: After ovulation, the Graafian... View Article
The middle piece of the sperm contains
A) mitochondria B) proteins C) nucleus D) centriole Answer: A) mitochondria Explanation: Numerous mitochondria are present in the middle piece, coiled... View Article
Blastopore is the pore of
A) blastocoel B) archenteron C) alimentary canal D) coelom Answer:B) archenteron Explanation: Archenteron is the primitive gut formed during the... View Article
