7.1 inheritance

Question 1

gene

Answer 1

sequence of bases on a NA molecule which code for a polypeptide, resulting in a characteristic

Question 2

allele

Answer 2

different forms of genes

Question 3

genotype

Answer 3

genetic composition of an organism

Question 4

phenotype

Answer 4

characteristics of an organism which are often visible, resulting from the genotype and the environment

Question 5

dominant allele

Answer 5

always expressed in the phenotype

Question 6

recessive allele

Answer 6

only expressed in the phenotype when homozygous

Question 7

codominant alleles

Answer 7

alleles which are both expressed in the phenotype if both are present

Question 8

sex-linkage gene

Answer 8

a gene that is carried on the X or Y chromosome

Question 9

locus

Answer 9

fixed position of a gene on a chromosome

Question 10

hetrozygous

Answer 10

two different alleles for a particular gene

Question 11

homozygous

Answer 11

having two of the same allele for a particular gene

Question 12

carrier

Answer 12

a person carrying an allele which is not expressed but can be passed onto offspring

Question 13

monohybrid inheritance

Answer 13

inheritance of a characteristic controlled by a single gene

Question 14

dihybrid inheritance

Answer 14

inheritance of two pairs of alleles

Question 15

what does a monohybrid cross show you

Answer 15

the likelihood of different alleles of that gene being inherited by the offspring of certain parents

Question 16

what does a dihybrid cross show you

Answer 16

how two different genes are inherited at the same time