Name the disorder caused due to the absence of one of the X-chromosomes in a human female.
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In tobacco plant, the male gametes have twenty four chromosomes. What is the number of chromosomes in the female gamete?
Number of chromosomes in female gamete is 24 Number of chromosomes in zygote is 48, as it is formed after fertilization of both male & female gamete.
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Internal fertilization occurs Option A: in female body. Option B: outside female body. Option C: in male body. Option D: outside male body.
Correct Option: A Internal fertilization occurs inside female body
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Name the parts of the human female reproductive system where (i) fertilisation takes place, (ii) implantation of the fertilised egg occurs.
(a) Testes produce sperms and secrete a hormone called testosterone. The function of testosterone is to control the development of male sex organs and secondary sexual features. (b) (i) Oviduct or fallopian tubes (ii) Uterus Alter implantation,...
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What are chromosomes? Explain how in sexually reproducing organisms the number of chromosomes in the progeny is maintained.
Chromosomes are thread-like structures, made of proteins and DNA, found in the nucleus at the time of cell division. In sexually reproducing organisms, the gametes undergo meiosis, and hence, each gamete...
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Name the stage of Plasmodium that gains entry into the human when bitten by an infected female Anopheles.
Sporozoites, Answer is correct
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(a) Name a terminal method to prevent pregnancy in humans. (b) Describe the procedure of the terminal method carried in human male and female.
(a) Surgical methods / Sterilisation (b) Males - Vasectomy , a small part of vas deferens is removed or tied up through a small incision on the scrotum Females - Tubectomy ,...
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Name two water soluble vitamins, state their sources and the diseases caused due to their deficiency in diet.
B group vitamin and vitamin C are soluble in water. Name of Vitamins Sources Deficiency diseases (i) Vitamin B12 Meat, fish, egg and curd Pernicious anaemia (ii) Vitamin C Citrus fruits and amla Scurvy
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Name two fat soluble vitamins. State their sources and the diseases caused due to their deficiency in diet.
Fat soluble vitamins Sources Deficiency diseases Vitamin A Fish liver oil, carrots, milk Xerophthalmia, Night blindness. Vitamin D Exposure to sunlight, fish and egg. Rickets and osteomalacia. Vitamin E Vegetable oils like wheat germ oil, sunflower oil, etc. Sterility and muscular...
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In a certain taxon of insects some have 17 chromosomes and the others have 18 chromosomes.
a. males and females, respectively
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Give one example of Mendelian disorder from each of autosomal dominant and autosomal recessive character observed in human being.
Autosomal dominant – Polydactyly or Huntington chorea Autosomal recessive – Alkeptoneuria (A.K.U) or phenylketonuria (P.K.U) or Sickle cell anemia.
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