B1 - Flashcards in GCSE Biology

Created by: isobelirwin
Created on: 26-04-14 16:58

Describe how mature eggs are used in IVF treatment so that the women may become pregnant.

Fertilised by sperm to form embryos / ball of cells or cell division. (Embryo) inserted into mother’s womb / uterus.

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What are the roles of FSH, Oestrogen and LH?

FSH-Causes egg to mature in one of the ovaries, stimulates the ovaries to produce oestrogen. Oestrogen- Causes the pituitary gland to produce LH, inhibits further release of FSH. LH- Stimulates release of an egg at the middle of the menstrual cycle.

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Describe how to prepare bacterium in a Petri dish.

Petri dish, agar sterilised-kill unwanted bacteria. Inoculating loop in flame-sterilise. Loop used to spread bacterium. Lid opened as little as possible and sealed with tape-prevent microbes from air entering. Incubate-allow growth of bacteria.

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Explain how shoots grow towards the light as they grow.

There is an unequal (lateral) distribution of the hormone auxin. There is more hormone on dark side which causes growth on dark side.

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What are the stages of genetic modification in animals?

The desired gene(s) is cut out, using enzymes. (Gene) transferred to animal at early stage of development / embryo / egg.

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Some scientists are worried about the production of GM animals. Suggest why?

Could transfer gene to other species. Effects on food chains. Effects on species themselves, e.g. may out compete non GM animals.

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Other cards in this set

Card 2

Front

What are the roles of FSH, Oestrogen and LH?

Back

Card 3

Front

Describe how to prepare bacterium in a Petri dish.

Back

Card 4

Front

Explain how shoots grow towards the light as they grow.

Back

Card 5

Front

What are the stages of genetic modification in animals?

Back

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B1