Doubtly
@Doubtly · Joined Feb 2021
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- Why are the small numbers of surviving tigers a cause of worry from the point of view of genetics? The small number of members in a population of tigers do not allow large number of variation to occur which are essential to survival of the... 1
- Why are traits acquired during the life-time of an individual not inherited? This happens because an acquired trait involves change in non-reproductive tissues which cannot be passed on to germ cells or the progeny. T... 1
- What are the different ways in which individuals with a particular trait may increase in a population? Individuals with a particular trait may increase in a population as a result of the following: Natural selection: When that trait offers som... 2
- How is the sex of the child determined in human beings? In human beings, the females have two X chromosomes and the males have one X and one Y chromosome. Therefore, the females are XX and the mal... 1
- A man with blood group A marries a woman with blood group O and their daughter has blood group O. No. This information is not sufficient to determine which of the traits - blood group A or O - is dominant. This is because we do not know a... 1
- How do Mendel's experiments show that traits are inherited independently? Mendel crossed pure breeding tall plants having round seeds with pure breeding short plants having wrinkled seeds. The plants of F_(1 )gener... 1
- How do Mendel's experiments show that traits may be dominant or recessive? The trait which appears in all the members of F_(1 )generation and also in 75% numbers of F₂ generation obtained by self fertilization of F₁... 1
- How does the creation of variations in a species promote survival? Variations occur due to sexual reproduction and also due to inaccurate copying of DNA. Depending on the nature of variations, different indi... 1
- If a trait A exists in 10% of a population of an asexually reproducing species and a trait B exists in 60% of the same Trait B because in asexual reproduction traits which are present in the previous generation are carried over to next generation with minimal... 1
- What could be the reasons for adopting contraceptive methods? Contraceptive methods are mainly adopted because of the following reasons: To prevent unwanted pregnancies. To control population rise or bi... 1
- How does reproduction help in providing stability to populations of species? Reproduction is the process of producing new individuals of the same species by existing organisms of a species, so, it helps in providing s... 1
- How are the modes for reproduction different in unicellular and multicellular organisms? In unicellular organisms, reproduction occurs by the division of the entire cell. The modes of reproduction in unicellular organisms can be... 1
- What are the different methods of contraception? The contraceptive methods can be broadly divided into the following types: Natural method: It involves avoiding the chances of meeting of sp... 1
- Draw a labelled diagram of the longitudinal section of a flower. Read the text in diagram :: 1
- Why does menstruation occur? Menstruation is a process in which blood and mucous flows out every month through the vagina. This process occurs every month because one eg... 1
- What are the functions performed by the testis in human beings? Functions of testes: Produce sperms, which contain haploid set of chromosomes of father. Produce a hormone called testosterone, which brings... 1
- What are the advantages of sexual reproduction over asexual reproduction? Advantages of sexual reproduction: In sexual reproduction, more variations are produced. Thus, it ensures survival of species in a populatio... 1
- The anther contains (a) sepals. (b) ovules. (c) carpel. (d) pollen grains. Correct option is d) pollen grains. The anther contains pollen grains. 1