Double-strand breaks are introduced at many instances along the chromosomes, and single-stranded DNA segments developing at these breaks interact... View Article
A. Both are due to a quantitative defect in globulin chain synthesis B. Thalassemia is due to less synthesis of globulin molecules C. Both are... View Article
A) Thalassemia is due to less synthesis of globin molecules B) Both are due to a quantitative defect in globin chain synthesis C) Both are due... View Article
Birds show female heterogamety, i.e. the females have different types of chromosomes and are responsible for sex determination. Males have two... View Article
Yellow/green are the contrasting traits of seed colour and round/wrinkled are the contrasting traits of seed shape of the pea plant. Here yellow... View Article
In the test cross, the dominant phenotype whose genotype is to be determined is test crossed with the recessive phenotype. The ratio of the... View Article
The phenotype of a plant with the genotype Tt would be tall. Here tallness (T) is a dominant trait over dwarfness (t), which is recessive.... View Article
Doctors inject oxytocin to induce labour pain and delivery. Oxytocin is released by the posterior pituitary in response to the foetal ejection... View Article
In human beings, pregnancy lasts for around 9 months. It is called the gestation period, i.e. the period of embryonic development. The gestation... View Article
A) 1 B) 4 C) 2 D) 8 Answer:Â C) 2 Explanation: Sperms are produced by the process of spermatogenesis from the male germ cells. Each primary... View Article
A) mesoderm B) ectoderm C) ectoderm and mesoderm D) endoderm Answer:Â A) mesoderm Explanation: The inner cell mass differentiates into three... View Article
A) mesoderm B) ectoderm C) ectoderm and mesoderm D) endoderm Answer:Â B) ectoderm Explanation: The inner cell mass differentiates into three... View Article
A) luteinizing hormone B) luteotrophic hormone C) progesterone D) estrogen Answer:Â C) progesterone Explanation: Corpus luteum secretes... View Article
A) middle piece of sperm B) polar bodies C) acrosome D) mature eggs Answer:Â D) mature eggs Explanation: Fertilizin is a chemical secreted by... View Article
A) corpus callosum B) corpus artesia C) corpus albicans D) corpus luteum Answer:Â D) corpus luteum Explanation: After ovulation, the Graafian... View Article
A) mitochondria B) proteins C) nucleus D) centriole Answer:Â A) mitochondria Explanation: Numerous mitochondria are present in the middle... View Article
A) blastocoel B) archenteron C) alimentary canal D) coelom Answer:B) archenteron Explanation: Archenteron is the primitive gut formed during... View Article
