{"id":28429,"date":"2021-07-05T15:17:29","date_gmt":"2021-07-05T09:47:29","guid":{"rendered":"https:\/\/ncertsolutions.guru\/?p=28429"},"modified":"2021-07-05T15:17:29","modified_gmt":"2021-07-05T09:47:29","slug":"ncert-solutions-for-class-10-science-chapter-9","status":"publish","type":"post","link":"https:\/\/ncertsolutions.guru\/ncert-solutions-for-class-10-science-chapter-9\/","title":{"rendered":"NCERT Solutions for Class 10 Science Chapter 9 Heredity and Evolution"},"content":{"rendered":"

These NCERT Solutions for Class 10 Science<\/a> Chapter 9 Heredity and Evolution Questions and Answers are prepared by our highly skilled subject experts to help students while preparing for their exams.<\/p>\n

Heredity and Evolution NCERT Solutions for Class 10 Science Chapter 9<\/h2>\n

Class 10 Science Chapter 9 Heredity and Evolution InText Questions and Answers<\/h3>\n

In-text Questions (Page 143)<\/span><\/p>\n

Question 1.
\nIf a trait A exits in 10% of a population of an asexually reproducing specie’s and a trait B exists in 60% of the same population, which trait is likely to have arisen earlier ?
\nAnswer:
\nBoth the traits arise in the same position, trait A will exist 10% and trait B will be exist in 60% ratio at the same time. For the segeregation of traits sexual reproduction (crossing of) is essential without sexual reproduction traits will not be segregated.<\/p>\n

Question 2.
\nHow does the creation of variations in a species ensure survival ?
\nAnswer:
\nCreation of variations in a species survive by the synthetic theory of Evolution in which organ origin of species is based on the interaction of genetic variation and natural selection<\/p>\n

In-text Questions (Page 147)<\/span><\/p>\n

Question 1.
\nHow do Mendel’s experiments show that traits may be dominant or recessive ?
\nAnswer:
\nWhen plants which are dissimilar in given character (such as flower colour) are crossed; the two characters thus brought together differ markedly in ability to express themselves in the resulting hybrid plant.<\/p>\n

When the pure red flowered plant is crossed with a pure white flowered plant; all the offspring of F1 generation resemble the red parent. Such a character which appears (as a red flower colour) was termed by Mendel as ‘dominent’ whereas the other character which fails to appear in offspring (as the white flower colour) was termed ‘recessive’.<\/p>\n

Question 2.
\nHow do Mendel’s experiments show that traits are inherited independently ?
\nAnswer:
\nAccording the Mendel’s Law of segregation traits are inherited independently, When two of the red flowered plants of F1 generation are crossed; both red flowered and white flowered plants appear in the off spring of the F2 generation.
\n\"NCERT<\/p>\n

Question 3.
\nA man with blood group ‘A’ marries a woman with Blood group ‘O’ and their daughter has blood group ‘O’. Is this information enough to tell you which of the traits-blood group A or O is dominant? Why or why not?
\nAnswer:
\nBlood group ‘O’ is dominant because in F1 generation only dominant traits appear.<\/p>\n

\"NCERT<\/p>\n

Question 4.
\nHow is the sex of the child determined in human beings?
\nAnswer:
\nSex determination takes place in human being as follows:
\nThe human male has one x chromosome and oney chromosome. That half the sperms will have x chromosomes and the other half sperms will have y chromosomes. A human female has two x chromosomes (but no y chromosomes) That, is; all the ova (or eggs) will have only x chromosomes. The sex of a child depends on what happens at fertilization.<\/p>\n

(a) If sperm carrying x chromosome fertilizes an ovum (or egg) which carries x chromosome; then the child born will be a girl (or female). This is because the child will have xx combination of sex chromosome.<\/p>\n

(b) If a sperm carrying y chromosome fertilizes an ovum (or egg) which carries x chromosomes then the child born will be a boy (or male) this is because the child will have xy combination of chromosomes.
\n\"NCERT<\/p>\n

In-text Questions (Page 150)<\/span><\/p>\n

Question 1.
\nWhat are the different ways in which individuals with a particular trait may increase in a population?
\nAnswer:
\nDifferent ways in which individuals with a particular trait may increase in a population:<\/p>\n