Genetic Q (key) - 1. Usually, human eye color is inherited...

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1. Usually, human eye color is inherited as if brown eyes were due to dominant factor and blue to the corresponding recessive. A man with blue eyes marries a brown-eyed woman whose mother has blue eyes. What proportion of their children would be expected to have blue eyes? bb B b From mother bb B b B b b B b bb b B b bb 50% of children expected to have blue eyes
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2. A blue-eyed man and a brown-eyed woman have two brown-eyed girls . Can you determine the genotype of the parents? If these same two people subsequently have a blue-eyed boy , does this change or confirm the genotype you assigned the parents? bb B b or BB X 2♀ B b 1 ♂ bb ♀(mother) genotype is B b
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3. Which is more likely, two brown-eyed parents producing a blue-eyed child or two blue-eyed parents producing a brown-eyed child? Brown-eyed parents A blue-eyed child Bb X Bb bb Blue-eyed parents A brown-eyed child bb X bb Only possible by mutation
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4. A brown-eyed man and a blue-eyed woman have two blue-eyed children . What are t/he chances that their next child will have blue eyes B b or BB X bb bb The father must be B b b b B B b B b b bb bb bb B b Next child: 50% possibility of being blue- eyed. The possibility is always 50%. It does not change because parents already have 2 blue-eyed children.
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5. In garden peas, tallness is dominant and dwarfness is recessive. A heterozygous tall plant is crossed with a dwarf plant. If 40 offspring are produced, how many of them would be expected to be tall? dwarf = t Tall = T Tt x tt T t t Tt tt t Tt tt Tt tt 50% Tall (Tt) 50% dwarf (tt) 40 offspring 20 Tall 20 dwarf
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6. In garden peas, tallness is dominant over dwarf condition and the round-seed trait is dominant over the wrinkled-seed trait. These genes are on separate
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Genetic Q (key) - 1. Usually, human eye color is inherited...

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