Biology

Inheritance is the transmission of genetic information from one generation to the next. Genetic information is carried by DNA in chromosomes.

What is a drug? A drug is a substance that modifies chemical reactions in the body. Drugs can change how cells, tissues, organs, or organ systems work. Some drugs are used as medicines to prevent or treat disease; other drugs may be harmful or addictive. The effect of a drug depends on the chemical reaction or process that it changes. A drug may: reduce symptoms; destroy or inhibit a pathogen; or change the activity of body cells. This guide focuses on antibiotics and antibiotic resistance. ...

Reproduction Marking Scheme This is the marking scheme for quiz: B16 - Reproduction Quiz Topic Guide: B16 - Reproduction Total: 32 marks Q1 [1 mark] Answer: B. Two gamete nuclei fuse to form a diploid zygote. Q2 [1 mark] Answer: B. Transfer of pollen from anther to stigma. Q3 [1 mark] Answer: A. Water, oxygen, and a suitable temperature. Q4 [1 mark] Answer: B. LH. Q5 [1 mark] Answer: C. HIV is an STI-causing virus that may lead to AIDS. ...

Reproduction Quiz Instructions: Answer all questions. Total: 32 marks. Multiple-choice questions Q1 [1 mark] Which statement correctly describes sexual reproduction? A. One parent produces genetically identical offspring without gamete fusion. B. Two gamete nuclei fuse to form a diploid zygote. C. A diploid cell divides to produce genetically identical offspring. D. Pollen is transferred from anther to stigma. Q2 [1 mark] What is pollination? A. Fusion of a pollen nucleus with an ovule nucleus B. Transfer of pollen from anther to stigma C. Growth of a pollen tube through the ovary D. Development of a zygote into an embryo ...

Reproduction produces new organisms. Asexual reproduction uses one parent and produces genetically identical offspring. Sexual reproduction involves fusion of nuclei from two gametes, producing a genetically different offspring. Asexual and sexual reproduction Asexual reproduction Asexual reproduction needs one parent and no fusion of gamete nuclei. Offspring are genetically identical to the parent and to one another, except for mutations. Examples include: Binary fission in some single-celled organisms Budding in yeast Runners producing new plantlets in plants such as strawberries Bulbs, tubers, or stem cuttings producing new plants Advantages in a stable environment: ...