Tag: changes at puberty

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Multiple choice biology the age of adolescence menstruation in females changes at puberty what happens if an egg is not fertilized?

The cause of Cat-cry syndrome is due to

  1. Loss of a segment of X-chromosome

  2. Loss of a segment of 5"' chromosome

  3. Loss of segment of Y-chromosome

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Cat-cry or cri-due chat syndrome is caused by the deletion of short arm of chromosome number 5 (5p). So, the genotype of affected individual in 46, XX, Sp- in female and 46, XX, 5p in males.

Multiple choice biology the age of adolescence menstruation in females changes at puberty what happens if an egg is not fertilized?

Sexual dimorphism describes

  1. Morphological difference

  2. Physiological difference

  3. Behavioural difference

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Sexual dimorphism is the changes that are observed in two sexes of the same organism. There are differences observed in the morphology. The females are smaller than the males. There are physiological changes due to the hormones which are produced in the males and females. The major hormone in the males is testosterone and in the females is oestrogen which is responsible for the difference in the sexual behaviour. There is also a difference in the behaviour. The males are defensive and protective due to the masculine nature. 

Thus, the correct answer is option D. 

Multiple choice biology the age of adolescence menstruation in females changes at puberty what happens if an egg is not fertilized?

Development of an egg without fertilization is called

  1. Gametogenesis

  2. Parthenogenesis

  3. Abiogenesis

  4. Sporogenesis
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Parthenogenesis, a reproductive strategy that involves the development of a female (rarely a male) gamete (sex cell) without fertilization. Parthenogenetic species may be obligate (that is, incapable of sexual reproduction) or facultative (that is, capable of switching between parthenogenesis and sexual reproduction depending upon environmental conditions). An egg produced parthenogenetically may be either haploid (i.e., with one set of dissimilar chromosomes) or diploid (i.e., with a paired set of chromosomes). The production of female offspring by parthenogenesis is referred to as thelytoky 

So the correct option is 'parthenogenesis'.

Multiple choice biology the age of adolescence menstruation in females changes at puberty what happens if an egg is not fertilized?

Sexual dimorphism is the 

  1. Genotypic difference

  2. Phenotypic difference

  3. Neurological difference

  4. Both A and B
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
  • Sexual dimorphism refers to the condition where the two sexes of the same species show different characteristics apart from the differences in their sex organs.
  • As both sexes consist of different chromosome pattern ( for e.g. XX AND XY in human beings), they differ genotypically.
  • Those observable characters which are visible to us and helps us in knowing the sex of any animal/plant without knowing their chromosome pattern are essentially what phenotypic difference is about.
  • So, the correct answer is 'Both A and B'.