inherirtance Flashcards
what is gamete?
a cell with half the number of chromosomes of the parent cell
name the male and female gametes in a)human b) a daisy plant
a) male =sperm female= egg
b) male= pollen female= egg
how many chromosomes are found in the nucleus of a human:
a) ovary cell?
b) egg cell?
c) embryo cell?
d) a cell after fertilisation has occured?
e) a testes cell?
a) 46
b) 23
c) 46
d) 46
e) 46
name the shape which is best describes the DNA polymer
double helix
how is DNA organised inside the cell nucleus?
Arranged in chromosomes
which is larger,a chromosome or gene?
chromosome
what does a gene code for?
a particular sequence of amino acids
write down the definition of the genome of a horse
all the genetic material of the horse
list two reasons why it is important to understand more about the human genome
to be able to identify the genes which are linked to different diseases
to understand and be able to treat inherited disorder
to use in tracing human migration patterns from the past
what are three advantages of sexual reproduction?
produce variation in the offspring
if enviroment changes can give a survival advantage meaning some organisms are likley to survive
humans can speed up natural selection by selective breeding to increase food production
what are three advantages of asexual reproduction?
only one parent needed
more time and energy effcient as do not need to find a mate
faster than sexual reproduction
many identcial offspring can be produced when conditions are favourite
list three organisms which produce using both sexual and asexual reproduction
malarial parasites
fungi
strawberry plants
daffodils
where would you find nucleotide?
DNA
what does a nucleotide consist of?
common sugar,phosphate group,base
what are the symbols of the 4 bases found in DNA?
A T C G
