The rungs of the DNA ladder are made of:

1) Glucose and sugars

2) Base pairs

3) Phosphates and hydrogen

4) Sugars and phosphates

2. Base Pairs

Explanation:

The rungs of DNA are made up of nitrogenous bases: adenine, thymine, guanine and cytosine. Adenine pairs with thymine, and cytosine pairs with guanine.

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ans.

gregor john mendel is known for study of inheritance in pea plants. he used garden pea plant for his study, having alternative traits for various characters. he performed cross-breeding in pea plants to check how characters are transmitted between parents to offspring, such as cross between pure tall and pure dwarf plant. mendel studied the inheritance patterns in pea plants for various generations.

thus, the correct answer includes options and f).