Topic 7

Question 1

gene

Answer 1

sequence of DNA bases that codes for a protien that can result in a characeristic

Question 2

alleles

Answer 2

different versions of the same gene

most animals and humans only contain 2 copies of the same gene- one from each parent

Question 3

Locus

Answer 3

the fixed position that alleles of the same gene are found

Question 4

diploid organisms

Answer 4

have two copies of each chromosome (one from each parent)

Question 5

genotype

Answer 5

different alleles an organism has

Question 6

phenotype

Answer 6

the visible characteristics of an organism based on both the genotype and the enviroment

Question 7

codominant alleles

Answer 7

when both alleles are expressed in the phenotype because neither one is recessive

eg) codominant genes for a white flower and a red flower would produce a pink flower

Question 8

monohybrid inheritance

Answer 8

inheritance of a characteristic controlled by a single gene

Question 9

what is the ratio for a monohybrid cross with two heterozygous parents

Answer 9

usually 3:1 (dominant : recessive)

Question 10

what is the expected ratio of a monohybrid cross with two heterozygous parents involving codominant alleles

Answer 10

1:2:1