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Biology
4. Heredity and Evolution
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Q7 of 167 Page 191

What are the chromosomes XY and XX known as?

These are known as the sex chromosomes. Females have XX as the set of sex chromosome whereas males have XY as the set of sex chromosome


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5

Mendel said that the characteristics or traits of organisms are carried from one generation to the next by internal factors which occur in pairs. What is the modem name for these factors?

6

Some plants occur in one of the two sizes: tall or dwarf. This characteristic is controlled by one pair of genes. Tallness is dominant to dwarfness. Choose suitable letters for this gene pair.

8

Which of the two, sperm or ovum, decides the sex of the child?

9

State whether the following statement is true or false:

Questions · 167
4. Heredity and Evolution
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