Inheritance And Selection

Question 0

Define phenotype

Answer 0

The observable characteristics of an organism (how the gene is expressed)

Question 1

Define genotype.

Answer 1

The genetic composition of an organism

Question 2

Define mutation

Answer 2

Any change to the genotype as a result of a change to the DNA

Question 3

Define gene

Answer 3

Length of DNA on a chromosome normally coding for a particular polypeptide

Question 4

Define allele

Answer 4

One form of a gene

Question 5

Define locus

Answer 5

The position of a gene on a chromosome

Question 6

What is meant when an organism is described as having multiple alleles?

Answer 6

When their gene has more than two allelic forms

Question 7

What is meant by co-dominance

Answer 7

If both alleles contribute to the phenotype

Question 8

What is meant by modification?

Answer 8

Any change to the phenotype that does not affect the genotype

(It is not inherited)

Question 9

State the basic law of genetics

Answer 9

In diploid organisms characteristics are determined by alleles that occur in pairs. Only one of each pair of alleles can be present in a single gamete.

Question 10

How many pairs of chromosomes do humans have?

Answer 10

23 pairs