Question 511 MarkWhat name is given to the sequence of gradual changes over millions of years in which new species are produced?AnswerEvolution.View full question & answer→
Question 521 MarkWhat is meant by ‘heredity’? What are the units of heredity.AnswerThe transmission of characters from parents to the offspring’s is called heredity. The units of heredity are genes.View full question & answer→
Question 531 MarkWhat sizes of plants are produced if both parents have genes Tt?AnswerThree tall plants and one dwarf plant.View full question & answer→
Question 541 MarkWhat are the chromosomes XY and XX known as?AnswerSex Chromosomes.View full question & answer→
Question 551 MarkIn a human, how many chromosmes are present in:a skin cell?Answer46.View full question & answer→