L1 Flashcards
(28 cards)
What is the label for Structure A in the student’s diagram of a cheek cell?
Cell membrane
Structure A is typically the outermost layer of a cell, which controls the movement of substances in and out.
What is the label for Structure B in the student’s diagram of a cheek cell?
Cytoplasm
Cytoplasm is the jelly-like substance within the cell membrane that contains organelles.
What is the label for Structure C in the student’s diagram of a cheek cell?
Mitochondria
Mitochondria are known as the powerhouse of the cell, generating energy in the form of ATP.
What is the label for Structure D in the student’s diagram of a cheek cell?
Nucleus
The nucleus contains the cell’s genetic material and controls its activities.
What impact is mistletoe likely to have on the tree?
The tree can’t grow as much.
Mistletoe, being a parasite, siphons off nutrients and water, hindering the tree’s growth.
What is the structure of DNA?
A double helix composed of nucleotides
DNA’s structure is essential for its function in genetic information transmission.
Who were the key contributors to the development of the DNA model?
Watson, Crick, Wilkins, and Franklin
Their collaboration led to the current understanding of DNA structure and function.
What does variation refer to in biology?
The difference in characteristics between individuals within a species
Variation can arise from both inherited and environmental factors.
Define continuous variation.
Variation that shows a range of options, which gradually differ from one another
Examples include height and weight, which can take on many values.
Define discontinuous variation.
A characteristic of any species with only a limited number of possible choices
Examples include blood type and flower color, which fall into distinct categories.
What is a species?
A group of similar organisms that can breed with one another to produce fertile offspring
For instance, humans belong to one species, while dogs belong to another.
What is a population in biology?
All the organisms of the same or closely related species in an area
This concept is crucial for studying ecosystems and biodiversity.
What is a characteristic in biology?
A feature of an organism
Characteristics can vary among individuals of the same species.
Fill in the blank: Variation is the difference in characteristics between individuals within a _______.
species
This concept is fundamental in understanding biodiversity.
What is the significance of understanding continuous and discontinuous variation in genetics?
Helps determine how traits are inherited and influenced
This understanding is crucial for genetic research and selective breeding.
True or False: Continuous variation is usually controlled by a single gene.
False
Continuous variation is often influenced by multiple genes and environmental factors.
What are some examples of continuous variation in humans?
- Height
- Weight
- Skin color
These traits can take on a range of values rather than distinct categories.
What are some examples of discontinuous variation in humans?
- Blood type
- Dimples
- Earlobe attachment
These traits are categorical and do not have intermediate values.
What is the definition of the term variation?
Variation refers to the differences among individuals in a population.
What are the two types of variation?
Continuous variation and discontinuous variation.
Define continuous variation.
Continuous variation is a type of variation where traits can take any value within a range.
Define discontinuous variation.
Discontinuous variation is when traits have distinct categories with no intermediate values.
Identify a characteristic of continuous variation.
Traits display a range of values.
Identify a characteristic of discontinuous variation.
Traits fall into distinct categories.
