multicellular organisms
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- Created by: islaramsay
- Created on: 18-02-18 14:26
What are the reproductive organs in animals?
gonads
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what are the sex cells in animals?
eggs and sperm
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What is the process of fetilisation?
the sperm and egg join together to create a zygote which contains 46 chromosomes in 23 pairs, which then goes on to form an embryo
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What is the location of fertilisation?
in the fallopian tube away from the uterus, close to ovaries
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what is the development of the embryo?
the zygote divides repeatedly as it goes down the fallopian tube, and when it enters the uterus 3-5 days later, the embryo is formed. the organs begin to form and are complete around 10 weeks after fertilisation and is then considered a fetus.
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why is sexual reproduction important?
reproduction is important because it is responsible for all living things and without it, life would come to an end
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What is sexual reproduction?
the production of new living organisms by combining genetic information from both male and female
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What is a-sexual reproduction?
where no fertilisation is occured, only one sex cell is needed which means offspring are genetically identical to eachother.
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what is the importance of asexual reproduction?
because it allows organisms to reproduce quickly
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what are the ethical issues surrounding IVF?
it can cause things such as birth at low weight, miscarrage or ovarian cancer.
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why do we need our senses?
so your brain knows what is going on around you
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how do the sense organs identfy different stimuli?
they detect changes in the enviroment and turn them into electral impulses
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what is the journey of an electral impulse through the nervous system?
the electrical impulse is carried by an axon and is protected by a fatty sheath which increases the speed at which the nerve system is transmitted
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what does the brain do?
it processes and interprets the information from the senses.
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what is the function of the cerebrum?
It consists of the parietal, frontal, occipatal and temporal lobes, the site of memory and concious thoughts
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what is the function of the cerebullum?
controls balance and co-ordination?
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what is the function of the medulla?
controls breathing and heart rate
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what gland and hormone control the bodys water level?
pituitary gland and ADH
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what is homeostasis?
the ability to maintain internal stability
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how does the body maintain water balance?
the kidneys maintain the water by producing urine
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how does the body react when water concentrations are too high?
less water is reabsorbed into the blood and urine is more dilute
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how does the body react when water concentrations are too low?
more water is reabsorbed into the bloodand urine is more concentrated
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what is the function of the kidney?
extracts waste from the blood, balances body fluids and forms urine
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what is the function of ADH?
it constantly regulates and balances the amount of water in your blood.
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where is reabsorbation took place in the nephron?
in the loop of henle
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what is the concept of nature vs nurture?
nature is defined at the genetic or hormone based behaviours whereas nurture is defined as enviroment and expierence. the debate is about whether a persons development is inclined in their DNA or envirment
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what is the structure of dna?
it consists of two strands of dna twisted around eachother by complimentary bases looking like a twisted ladder or staircase
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What is dna?
a double stranded molucule that carries genetic information
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what is a genotype?
the part of a cell that contains all the organisms dna
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what is a phenotype?
the physical appearance resulting from the genes an organisms processes
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what is dominant?
the dna base that is complimentary to thymine, the more powerful trait in an offspring
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what is recessive?
a pair of complimentary bases in the rung of the twisted ladder, a gene masked by a dominant gene
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what is heterozygous?
a pair of genes where one is dominant and one is recessive
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homozygous meaning?
a gene that has identical alleles on both homologous chromosomes
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what is alleles?
a possible form of dna
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what is a gene?
carries the information that determines your traits
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what is genetic testing?
the stidy of a persons dna to identify genetic differences, abnormalty or diseases
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what does species mean?
a group of closely related organisms that are very similar to eachother
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what is the process of human evolution?
the process is in which organisms change over time as a result of changes in heritable physical or behavioural traits
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Other cards in this set
Card 2
Front
what are the sex cells in animals?
Back
eggs and sperm
Card 3
Front
What is the process of fetilisation?
Back
Card 4
Front
What is the location of fertilisation?
Back
Card 5
Front
what is the development of the embryo?
Back
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