{"id":7086,"date":"2024-02-23T07:50:31","date_gmt":"2024-02-23T02:20:31","guid":{"rendered":"https:\/\/www.aplustopper.com\/?p=7086"},"modified":"2024-02-23T16:00:16","modified_gmt":"2024-02-23T10:30:16","slug":"fundamentals-genetics-icse-solutions-class-10-biology","status":"publish","type":"post","link":"https:\/\/www.aplustopper.com\/fundamentals-genetics-icse-solutions-class-10-biology\/","title":{"rendered":"ICSE Solutions for Class 10 Biology – Fundamentals of Genetics"},"content":{"rendered":"

ICSE Solutions for Class 10 Biology – Fundamentals of Genetics<\/span><\/h2>\n

ICSE Solutions<\/a>Selina ICSE Solutions<\/a><\/p>\n

APlusTopper.com provides ICSE Solutions for Class 10 Biology Chapter 2 Fundamentals of Genetics for ICSE Board Examinations. We provide step by step Solutions for ICSE Biology Class 10 Solutions Pdf.\u00a0You can download the Class 10 Biology ICSE Textbook Solutions with Free PDF download option.<\/p>\n

Download Formulae Handbook For ICSE Class 9 and 10<\/a><\/p>\n

Short Questions<\/span><\/h3>\n

Question 1:<\/strong> What is a gene ? How is it related to heredity ?
\nAnswer:<\/strong> Genes are hereditary units located on a chromosomal thread. A gene can be defined as “ultimate unit of recombination, mutation and self-reproduction”. They are responsible for various characteristics externally shown by the plants and animals. A single gene may affect one or more characteristics of offsprings.<\/p>\n

Question 2:<\/strong> Define mutation and give its significance.
\nAnswer:<\/strong> Any change in genetic composition of an individual brought about by internal or external factors is called mutation. Mutation play a significant role in the evolution and speciation because they cause variability. However, some harmful mutations cause diseases.<\/p>\n

Question 3:<\/strong> What is crossing-over ? What are the factors affecting it ?
\nAnswer:<\/strong> Crossing-over is the interchange of the parts of the chromatid of a pair of chromosomes. High temperature, X-rays and radiation treatment are the factors affecting crossing-over.<\/p>\n

Question 4:<\/strong> Why did Mendel selected pea plants for his experiment ?
\nAnswer:<\/strong> Mendel selected pea plants for his experiment because of the following reasons :<\/p>\n

    \n
  1. A pea plant has many contrasting characters.<\/li>\n
  2. Self-fertilization takes place in pea plants and so it is possible to get a pure line of traits.<\/li>\n
  3. Flowers are bisexual and hermaphrodite. Therefore, cross pollination is achieved easily.<\/li>\n<\/ol>\n

    Question 5:<\/strong> Define Mendel’s law of segregation.
    \nAnswer:<\/strong> Law of Segregation or the law of purity of gametes : The two members of a pair of factors separate during the formation of gametes. They do not blend but segregate or separate into different gametes. The gametes combine together by random fusion at the time of zygote formation.<\/p>\n

    \"ICSE<\/p>\n

    Question 6:<\/strong> What is monohybrid cross ? How did Mendel performed this cross ?
    \nAnswer:<\/strong> Monohybrid cross : It is a cross where two forms of a single trait are crossed or hybridized.
    \nMendel performed this experiment on pea plant. He crossed the true breeding forms of tall and dwarf plants and obtained the hybrid progeny. This is called as first generation (F1<\/sub>) offspring plant to self-pollinate and produced the second generation (F2<\/sub>).<\/p>\n

    Question 7:<\/strong> A certain couple got four daughters in a sequence and no son. Does it mean that the husband does not produce Y-chromosome bearing sperms ? Explain.
    \nWhat is the chance of this couple having a daughter ?
    \nAnswer:<\/strong> Daughter or son is a matter of chance for Y- or X-chromosome carrying sperm to fertilize the egg. It is always 50% The couple got four daughters as a matter of chance encounter of the X-chromosome carrying sperm fertilizing the eggs. The chance of the couple getting another daughter is again 50% (so is for the son).<\/p>\n

    Question 8:<\/strong> Mutation alerts the hereditary material. Give reasons.
    \nAnswer:<\/strong> Mutation alerts the hereditary materiel of an organisms cell and result into change in certain characters of traits. For example:
    \n(a) Sickle-cell anemia, is a blood disease caused by gene mutation. The mutation causes change in the DNA which controls productivity of RBCs.
    \n(b) Radioactive radiations also alter the gene structure and their effects can be seen generation after generation.<\/p>\n

    Question 9:<\/strong> Why do men suffer from haemophilia and colour blindness ? Under what conditions do women suffer from these disorders ?
    \nAnswer:<\/strong> Haemophilia and colour blindness are sex-linked disorders, caused by recessive genes located on X-chromosome. These disorders occur more frequently in men because males are heterozygous for the defect. They have one X-chromosome and one Y-chromosome. Y- chromosome does not carry alleles for these traits, therefore the recessive genes are able to express even in single dose.
    \nFemales have two X-chromosomes therefore both the alleles have to be present in recessive form to be able to be expressed. Thus, females suffer only if they are homozygous for the trait which is possible only when a carrier or sufferer female marries a sufferer male.<\/p>\n