Heredity and variability

Question 1

Modification

Answer 1

the differences among organisms of one species, caused by differences in environment, not by differences in genes

Question 2

Variation

Answer 2

• the differences among organisms of one species

Question 3

Variation series

Answer 3

a range of differences (variants) of one particular trait among organisms in a population

Question 4

Chromosome

Answer 4

a DNA molecule, which carries genes with proteins called histones

Question 5

Gene

Answer 5

a fragment of DNA molecule, that stores information about one characteristic

Question 6

Sex chromosomes

Answer 6

chromosomes, which determine the sex of an organism

Question 7

Autosome

Answer 7

all chromosomes, except sex chromosomes

Question 8

Hemophilia

Answer 8

a hereditary human disease that impairs the blood clotting process.

Question 9

Blood types

Answer 9

the classification of blood according to the types of antigens on erythrocytes

Question 10

Locus

Answer 10

a certain position of a gene on a chromosome

Question 11

Linked genes

Answer 11

genes of one chromosome

Question 12

Crossing over

Answer 12

changing the equivalent segment between homologous chromosomes

Question 13

Incomplete dominance

Answer 13

a condition when heterozygous organism has a trait, that is between dominant and recessive traits

Question 14

Co-dominance

Answer 14

a condition when two alleles of a heterozygous organism have full appearance in a phenotype