Topic 6 - Heredity (Inheritance)

Question 1

Inheritance

Answer 1

• transfer of genetically determined characteristics from one generation to the next

Question 2

genetics

Answer 2

study of inheritance

Question 3

23 homologous pairs

how many is ___________

how many is ______

Answer 3

• 22 homologous pairs autosomal - somatic characteristics
• 1 pair sex chromosomes

Question 4

XY

male or female

Answer 4

Male

Question 5

XX

male or female?

Answer 5

Female

Question 6

alleles

Answer 6

genes occupying the same locus on homologous chromoosmes

Question 7

alleles may be:

Answer 7

homozygous or heterozygous

Question 8

homozygous

Answer 8

• same allele of a particular gene on homologous chromosomes
• e.g. both alleles express the same version of a trait
• e.g. blonde hair (bb), black hair (Bb)

Question 9

heterozygous

Answer 9

• different alleles of the same gene
• e.g. alleles code for different expressions of the same trait
• e.g. Bb

Question 10

catalogue of a person’s genes (genetic makeup)

​e.g. Bb

Answer 10

Genotype

Question 11

expression of genotype (genes) to give observable characteristics

e.g. black hair

Answer 11

Phenotype

Question 12

• expressed in phenotype regardless of other allele
• BB or Bb: ________ expressed
• e.g. black hair

Answer 12

dominant allele

B

Question 13

• expressed in phenotyp only if present on both alleles
• bb
• blonde hair

Answer 13

recessive allele

b

Question 14

• determines probability of inheritance
• predicts offspring genotype and phenotype
• hair colour trait BB x bb

Answer 14

punnet square

Question 15

• hemophilia
• colour-blindness
• duchenne’s muscular dystrophy

all due to recessive alleles on the X chromosome

Answer 15

sex-linked inheritance

Question 16

sex-linked inheritance

XY =

Answer 16

not truly homologous

Question 17

if gene is X-linked its expression is not masked because there is no corresponding allele on Y chromosome

XX = Homologous

Answer 17

:)

Question 18

sex-linked

is colour blindness a dominant or recessive trait?

Answer 18

recessive