Biology B5

  • Created by: Amy_5639
  • Created on: 09-04-18 19:14
1.What is an organism's genome?
The entire genetic material of an organism
1 of 22
2.Describe what is meant by the term 'phenotype'.
The physical characteristics that an organism has e.g. eye colour
2 of 22
3.What affects an organism's phenotype apart from its genotype?
The genotype affects its phenotype-the characteristics it displays
3 of 22
4.Give one example of continuous variation.
Height
4 of 22
5.Explain how a mutation leads to the formation of a genetic variant.
As the sequence of DNA bases in a gene codes for the sequence of amino acids that make up a protein, gene mutations sometimes lead to changes in the protein that it codes for
5 of 22
6.How likely is it that a variant will have a really big effect on an organisms phenotype?
Very unlikely
6 of 22
7.What are gametes?
In animals these are sperm and egg cells, they only contain half the number of chromosomes of normal cells
7 of 22
8.What does it mean if a cell is 'haploid'?
Only contain half the number of chromosomes of normal cells
8 of 22
9.What are the 23rd pair of chromosomes labelled as in a female?
**
9 of 22
10.What causes female characteristics in humans?
The lack of Y chromosomes causes female characteristics
10 of 22
11.Why does asexual reproduction produce offspring that are genetically identical?
An ordinary cell makes a new cell by dividing in two. The new cell has exactly the same genetic information as the parent cell
11 of 22
12.In a genetic diagram is a capital letter used to represent a dominant or recessive allele?
Dominant
12 of 22
13.What does it mean to be homozygous for a characteristic?
You have two alleles the same for that particular gene
13 of 22
14.Two flowers with genotypes RR and rr are bred together.a)draw a punnett square to show this cross.b)What will the possible genotypes of the offspring be?
a) b)
14 of 22
15.How are organisms divided into groups in a natural classification system?
They are divided into five kingdoms (e.g.plant kingdom, animal kingdom) and are then subdivided into smaller groups (e.g.phylum, class, order, family, genus, species)
15 of 22
16.What is the smallest group that organisms are divided into in the natural classification hierarchy?
Species
16 of 22
17.Describe how the invention of the microscope helped with the classification of organisms.
Because they could examine the structure of organisms in more detail
17 of 22
18.Describe how DNA sequencing is used in classification.
It compares the sequence of DNA bases for different species.The more similar the DNA sequence between species, the more closely related they are
18 of 22
19.How is evolution defined?
Evolution is the change in inherited characteristics of a population over time, through the process of natural selection
19 of 22
20.Why might the speed of evolution vary from species to species?
The speed at which a species evolves depends partly on how quickly it reproduces
20 of 22
21.How might evolution lead to the development of new species on Earth?
Evolution can mean that a species' phenotype changes so much that a completely new species is formed
21 of 22
22.Explain how antibiotic-resistant bacteria provide evidence for evolution.
Because there is a change in the inherited characteristics of a population over time, through the process of natural selection.Also, as bacteria reproduce so quickly, scientists are able to monitor the evolution as it's occurring
22 of 22

Other cards in this set

Card 2

Front

2.Describe what is meant by the term 'phenotype'.

Back

The physical characteristics that an organism has e.g. eye colour

Card 3

Front

3.What affects an organism's phenotype apart from its genotype?

Back

Preview of the front of card 3

Card 4

Front

4.Give one example of continuous variation.

Back

Preview of the front of card 4

Card 5

Front

5.Explain how a mutation leads to the formation of a genetic variant.

Back

Preview of the front of card 5
View more cards

Comments

No comments have yet been made

Similar Biology resources:

See all Biology resources »See all Evolution, extinction and natural selection resources »