inheritance

Question 1

inheritance

Answer 1

transfer of genetically determined characteristics from on generation to the next

Question 2

genetics

Answer 2

study of inheritance

Question 3

23 chromosome pairs

Answer 3

1. 22 homologous pairs autosomal- somatic characteristics

2. 1 pair sex chromosomes

Question 4

alleles

Answer 4

genes occupying the same locus on homologous chromosomes

-can be homozygous or heterzygous

Question 5

homozygous

Answer 5

same allele of a particular gene on homologous chromosomes

ie. both alleles express the same version of a trait
eg. blond hair bb. black hair BB

Question 6

heterozygous

Answer 6

different alleles of the same gene

id. alles code for different expressions of the same trait
eg. Bb

Question 7

genotype

Answer 7

catalogue of a person’s genes (genetic makeup)

eg Bb

Question 8

phenotypes

Answer 8

expression of genotype (genes) to give observable characteristics
eg. black hair

Question 9

dominant allele

Answer 9

eg B
expressed in phenotype regardless of other allele
BB or Bb- dominant allele expressed
eg. black hair

Question 10

recessive allele

Answer 10

eg b
express in phenotype only if present on both alleles
bb-blond hair

Question 11

prediction inheritance

Answer 11

punnett square

Question 12

punnett square

Answer 12

determines probability of inheritance

• predicts offspring genotype and phenotype
  eg. hair colour trait

Question 13

sex linked/ x-linked inheritance

Answer 13

non-sexual inheritance determined by gene on the x chromosome
eg. hemophilia, colour blindness, duchenne’s muscular dystrophy- all due to recessive alleles on the x chromosome

Question 14

XY

Answer 14

not truly homologous

-if gene is x-linked its expression is not masked b/c there is not corresponding allele on the Y chromosome

Question 15

colorblindness

Answer 15

refer to topic 6 notes