Question 1
- State the importance of a testcross in genetics
- Name the four organic bases that are present in the RNA molecule.
Answer
- it helps in determining the genetic constitution/genotype of an organism
- 1. Adenine
2. uracil
3. guanine
4. cytosine
Question 2.
The diagram below represents the sporophyte generation of a fern plant. Study it and answer the questions that follow. State the transport and synthetic roles of endoplasmic recticulum
- Name the parts labeled A and B
- Suggest the significance of the structure labeled C
Answer
-
A - frond;
B - pinna; - Produce spores which germinate into the gametophyte
Question 3
Give an example of a sex linked trait in humans on
- Y chromosome
- X chromosome
Answer
- Premature baldness
- Hemophilia
Question 4
State two ways by which plants compensate for lack of ability to move from one place to another
Answer
- Ability to pollinate; response (nastic, tropic) to stimuli;
- Ability to exploit localized nutrients;
- Ability to exploit localized nutrients;
Question 5
Explain why a constant body temperature is maintained in mammals
Answer
- Most enzymes within the body function within a narrow range of temperature;
- High temperature (above optimum) denatures enzymes;
- Low temperature inactivates enzymes
- High temperature (above optimum) denatures enzymes;
- Low temperature inactivates enzymes