B2.5 Flashcards

Descripción

GCSE (Unit 2) Biology Fichas sobre B2.5 Flashcards, creado por Mel Hughes el 31/08/2016.
Mel Hughes
Fichas por Mel Hughes, actualizado hace más de 1 año
Mel Hughes
Creado por Mel Hughes hace alrededor de 8 años
9
2

Resumen del Recurso

Pregunta Respuesta
Which type of cell division produces two identical cels from the original cell? Mitosis
What type of cells are produced by meiosis? Sex cells or gametes, eggs and sperm
Explain how four gametes are formed from one cell There are two sets of cell division. A body cell divides into two each divides again
Where are stem cells found in adult humans? Bone marrow
Which scientist worked out how characteristics are inherited? Mendel
What does a gene code for? The order of amino acids in a protein
Which sex chromosomes are found in human males? X and Y
What is meant by the term 'phenotype'? This is a description of the physical characteristics
Name a genetic disorder which is controlled by a dominant allele Polydactyly
What are the chances of a child having cystic fibrosis if one parent has the disorder and the other parent is heterozygous? 50%, as one parent (cc) has to pass on the allele, the other parent (Cc) has a 50% risk of passing it on; the child is either Cc or cc
What is embryo screening? Tests are carried out on the embryo to diagnose possible disorders
Why do cells divide by mitosis? To produce identical cells for growth and to replace cells
How many chromosomes does a human have in each body cell? 23 pairs (or 46)
Which type of cell division produces sex cells? Meiosis
What molecule are genes made of cells? DNA
What are 'alleles'? Different forms of a gene
Why does sexual reproduction result in variation? The genetic material from two parents is brought together when the sperm and egg nuclei fuse
Explain why offspring produced by asexual reproduction are genetically identical They are produced by mitosis. Cells from one parent divide to produce identical cells
What is meant by the term 'genotype'? The types of genes present in the cells
What do we mean by a 'heterozygous' individual? The individual has one dominant and one recessive allele for a condition
What are the chances of a child having polydactyly if one parent is heterozygous and the other parent is homozygous recessive? 50%, as the dominant gene controls the condition; a child has a 50:50 chance of inheriting the allele from the heterozygous parent
Mostrar resumen completo Ocultar resumen completo

Similar

AQA AS Biology unit 2 Variation
elliedee
GCSE AQA Biology - Unit 2
James Jolliffe
Function and Structure of DNA
Elena Cade
Plant and animal cells
Tyra Peters
AQA AS Biology Unit 2 DNA and Meiosis
elliedee
Biology AQA 3.1.3 Cells
evie.daines
Biology AQA 3.2.5 Mitosis
evie.daines
Biology AQA 3.1.3 Osmosis and Diffusion
evie.daines
Biology- Genes, Chromosomes and DNA
Laura Perry
Biology- Genes and Variation
Laura Perry
Enzymes and Respiration
I Turner