7a genetics

Question 1

define gene

Answer 1

sequence of bases on a dna molecule which codes for a protein which results in a characteristic

Question 2

define alelle

Answer 2

An alternative form of a gene that occurs at the same locus on homologous chromosomes

Question 3

define a genotype

Answer 3

All of the alleles present at the locus (or closely linked loci) of a blood group system, indicating chromosomal alignment if appropriate

Question 4

define phenotype

Answer 4

Observable characteristics of an organism

Question 5

define dominant

Answer 5

Gene/trait that appears or expresses itself

Question 6

define ressesive

Answer 6

Genes are recessive if the phenotype that they code for is only expressed when the genes are homozygous

Question 7

define codominant

Answer 7

alleles that are both expressed in the phenotype

Question 8

define locus

Answer 8

fixed position of gene on a chromosone

Question 9

define homozygote

Answer 9

organism that carries two same alleles

Question 10

define heterozygous

Answer 10

organism that carries two different alleles

Question 11

define carrier

Answer 11

carrying allele which is not expressed in phenotype but can be passed to offspring

Question 12

define monohybrid crosses

Answer 12

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

Question 13

when is a characteristic sex linked

Answer 13

when the allele that codes for it is located on a sex chromsone