Dihybrid & Sex-linked inheritance Flashcards

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1
Q

Define dihybrid inheritance

A
  • inheritance of 2 pairs of traits
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2
Q

Principle of independent assortment

A
  • each pair of alleles segregate independently during gamete formation
  • each pair of contrasted characters may be combined with another pair
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3
Q

Reason for independent assortment

A
  • behaviour of chromosomes at metaphase 1
  • homologous chromosomes line up is random
  • orientation of 1 pair does not influence others
  • when separate during anaphase 1, assorted independently
  • 4 diff types of gametes formed from heterozygous for 2 traits
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4
Q

Define sex-linked inheritance

A
  • involves traits found on either 1 of sex chromosomes
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5
Q

Why males have higher chance of having a sex-linked condition

A
  • XY chromosome, only have 1 X chromosome
  • males always inherit X-linked trait from mother, Y from father
  • females have 2 X chromosomes, potential of having at least 1 normal allele that will express phenotype over recessive allele
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6
Q

Trends of X-linked recessive conditions

A
  • only females can be carriers (heterozygous)
  • females cannot inherit X-linked recessive condition frm normal father
  • X-linked condition common in males, conditions cannot be masked by second allele
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7
Q

X-linked dominant traits

A
  • common in females
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