pack 9- inheritance

Question 1

define a gene

Answer 1

a sequence of bases on a DNA molecule that codes for a sequence of amino acids in a polypeptide chain

Question 2

define an allele

Answer 2

a different from of the same gene

Question 3

define genotype

Answer 3

the alleles in an organism, for a particular gene

Question 4

define phenotype

Answer 4

the observable characteristics due to the expression of a genotype/alleles which may be affected by environment.

Question 5

define recessive

Answer 5

both alleles need to be present in order for the recessive phenotype to be observed- only expressed if dominant allele is not present

Question 6

define dominant

Answer 6

only one allele needs to be present fro dominant phenotype to be observed

Question 7

define incomplete dominance

Answer 7

when there are two different alleles in the genotype and both alleles are expressed in the phenotype of the organism- both alleles have an equal weighting in the expression

Question 8

defien homozygous

Answer 8

genotype where both alleles present at a gene locus are the same

Question 9

define heterozygous

Answer 9

genotype where both alleles present at a gene locus are different

Question 10

define homologous chromosome

Answer 10

a pair of chromosomes similar in length with the centromere and genes in the same position

Question 11

locus

Answer 11

position of an allele on a chromsome

Question 12

carrier

Answer 12

an organism with the heterozygous genotype. they have one allele for condition/characteristic but it is not expressed in the phenotype.

Question 13

monohybrid inheritance

Answer 13

inheritance of one gene is responsible for the expression of the genotype