Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
B2.5
Simple inheritance in animals and plants
| Question | Answer |
|---|---|
| chromosomes within the body are arranged in? | pairs |
| 4 reasons body cells divide by mitosis | growth repair replacement asexual reproduction |
| definition of a gene? | small packet of information that controls a characteristic or part of a characteristic of your body. it is a section of DNA |
| allele is? | different forms of the same gene. |
| genes grouped together on? | chromosomes |
| no. of chromosomes in body cells? | 46 |
| no. of chromosomes on gametes? | 23 |
| cell division in normal body cells happens by? | mitosis |
| how does mitosis work? | Before division, identical copies of the chromosomes are made. The cell then divides to form to genetically identical cells. |
| embryo cells are all? | stem cells - unspecialised |
| differentiation occurs when? | some genes switch off and some switch on, making the cell specialised for a specific purpose |
| cells that can always differentiate come from? | plants |
| cells that are irreversibly specialised are from? | animals |
| difficult to clone animals because? | animal cells differentiate permanently |
| mitosis happens? | all the time |
| meiosis produces | gametes |
| how does meiosis work? | same as mitosis, but cells than divide in two again. |
| gametes introduce variety because | each cell is slightly different |
| type of reproduction that results in variety? | sexual |
| egg and sperm cells fuse to form a? | zygote |
| zygote divides to form? | embryo |
| source of stem cells in adult humans? | bone marrow |
| stem cells could be used to? | cure many diseases |
| two ethical issues with using stem cells from embryos? | embryo is a potential human being embryo cannot give permission |
| therapeutic cloning theoretically could produce? | an embryo with identical DNA to the cell donor. |
| first person to suggest the existence of genes@ | Gregor Mendel in 1866 |
| plant Mendel used in experiments? | green and yellow peas |
| DNA stands for ? | deoxyribonucleic acid |
| structure of DNA? | double helix |
| No. of chemical bases that make up DNA | 4 |
| chemical bases grouped into? | threes |
| groups of bases code for a specific? | amino acid |
| DNA samples can be produced from? | body fluids |
| two X chromosomes mean you are? | female |
| a Y and an X chromosome mean you are? | male |
| genes are either? | dominant or recessive |
| definition of Homozygous? | two identical alleles for a characteristic, e.g. DD or dd |
| definition of Heterozygous? | individual |
| definition of Genotype? | describes the genetic makeup of an individual regarding a particular characteristic. |
| definition of phenotype? | describes physical appearance of an individual's characteristics |
| condition where babies are born with extra toes/fingers? | polydactyly |
| polydactyly is a ....................... allele. | dominant |
| cystic fibrosis is a .....................allele | recessive |
| genetic diagrams used to? | predict how likely genetic disorders/characteristics are to be passed on |
| 3 benefits of embryonic stem cells? | one of the best chances of finding cures for currently incurable diseases embryos are usually spares, so wouldn't become people anyway could grow new organs for transplants |
| 3 disadvantages of embryonic stem cells? | very experimental, and could later lead to cancer all embryos are potential babies money could be better spent on developing new drugs |
Created by:
duane.humphreys
Popular Biology sets