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Question
Females with Turners’ syndrome have
Options
Small uterus
Rudimentary ovaries
Underdeveloped breasts
All of these
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Solution
All of these
RELATED QUESTIONS
Pataus’ syndrome is also referred to as ____________.
Which of the following is not correct?
|
The chromosome number is fixed for all normal organisms leading to species specification whereas any abnormality in the chromosome number of an organism results into abnormal individuals. For example, in humans, 46 is the fixed number of chromosomes both male and female. In males it is '44 + XY' and in females, it is '44 +XX'. Thus the human male is heterogametic, in other words produces two different types of gametes one with '22 + X' chromosomes and the other with '22 + Y' chromosomes respectively. Human female, on the other hand, is homo gametic i.e. produce only one type of gamete with '22 + X' chromosomes only. Sometimes an error may occur during the meiosis of the cell cycle, where the sister chromatids fail to segregate called nondisjunction, leading to the production of abnormal gametes with altered chromosome numbers. On fertilisation, such gametes develop into abnormal individuals. |
(a) State what is aneuploidy. (1)
(b) If during spermatogenesis, the chromatids of sex chromosomes fail to segregate during meiosis, write only the different types of gametes with altered chromosome numbers that could possibly be produced. (1)
(c) A normal human sperm (22 + Y) fertilises an ovum with karyotype '22 +XX'. Name the disorder the offspring thus produced would suffer from and write any two symptoms of the disorder. (2)
OR
(c) Name the best-known and most common autosomal aneuploid abnormality in humans and write any two symptoms. (2)
Which of the following statement is correct about location of the male frog copulatory pad?
Which one of the following phytohormones promotes nutrient mobilisation which helps in the delay of leaf senescence in plants?
Given below are the stages in the life cycle of pteridophytes. Arrange the following stages in the correct sequence.
- Prothallus stage
- Meiosis in spore mother cells
- Fertilisation
- Formation of archegonia and antheridia in gametophyte.
- Transfer of antherozoids to the archegonia in presence of water.
Choose the correct answer from the options given below:
Name the class of enzyme that usually catalyse the following reaction:
S − G + S# → S + S# − G
where, G → a group other than hydrogen
S → a substrate
S# → another substrate
Match List - I with List - II.
| List - I | List - II |
| A. Chlorophyll a | I. Yellow-green |
| B. Chlorophyll b | II. Yellow |
| C. Xanthophylls | III. Blue-green |
| D. Carotenoids | IV. Yellow to Yellow-orange |
Choose the option with all correct matches.
A specialised membranous structure in a prokaryotic cell which helps in cell wall formation, DNA replication and respiration is ______.
All living members of the class Cyclostomata are ______.
