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2089450
B3 D-F
Description
Mind Map on B3 D-F, created by Emily Chalmers on 21/02/2015.
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Mind Map by
Emily Chalmers
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Created by
Emily Chalmers
almost 10 years ago
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Resource summary
B3 D-F
D
In mammals, body cells are diploid (two copies of each chromosomes)
Most new body cells are produced by mitosis
Prior to mitosis DNA replication occurs
Mitosis is needed for growth, replacement of cells, repair of tissues and asexual reproduction
Gametes are produced by meiosis
In sexual reproduction, to produce a unique individual, half the genes come from each parent
Gametes are haploid cells (contain one chromosomes of body cells)
Gametes have half the number of chromosomes of body cells
In sexual reproduction gametes join in fertilisation
In mitosis the chromosomes line up along the centre of the cell, they then divide and copies move to opposite poles of the cell
DNA replication involves: 'Unzipping' the DNA to form single strands. Forming double strands form by complementary base pairings
E
The ventricles pump blood
The left side pump blood to the body
The semilunar, tricuspid and bicuspid valves prevent backflow
The right side of the heart pumps blood to the lungs
Haemoglobin in red blood cells reacts with oxygen in the lungs to oxyhaemoglobin
Oxyhaemoglobin releases oxygen in tissues to form haemoglobin
Blood moves around the body in arteries, veins and capillaries
Arteries transports blood away from the heart
Veins transports blood to the heart
Capillaries exchange materials with tissues
Blood in arteries is under higher pressure than blood in veins
A double circulatory system is one in which blood travels through the heart twice during on complete circuit
F
Many plants can grow continuously
plants mainly gain height through cell enlargement
Many plant ells retain the ability to differentiate
Plant cell division is mainly restricted to areas called meristems
Stem cells are undifferentiated cells that can develop into different cells, tissues and organs
The process of cells becoming specialised is called differentiation
Growth is cell division followed by cells becoming specialsed
Wet mass is less accurate due to the variable water content
Growth can be measured as an increase in height, wet mass, or dry mass
Bacterial cells lack: a 'true' nucleus, mitochondria and chloroplasts
Vacuoles in plants contain cell sap and provides support
The plant cell wall is made of cellulose and provides support
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