BSC 1005 Genetics Exam questions n
answers graded to pass
Genetics - correct answer ✔✔the study on the basis of biological variability and how biological
characteristics are inherited
Who was the father of genetics and what did he study? - correct answer ✔✔Gregor Mendel and
he studied pea plants because they produce lots of offspring and can have lots of variation
What is Mendels Theory of Particulate Inheritance - correct answer ✔✔Inheritance is due to the
passing of particulate factors from one generation to the next in an unchanged form.
What controls traits? - correct answer ✔✔a pair of factors or genes
What is the Blending Theory of Inheritance and why is it wrong? - correct answer ✔✔It's the
theory that the characteristics of the parents are blended in the offspring. This is wrong because
not all children have all their characteristics soley from their parents.
What is the Doctrine of Fixity of Species and why is it wrong? - correct answer ✔✔It's the
doctrine that each species has a fixed and unchanging set of biological characteristics. This is
wrong because crossbreeding and inbreeding has been used to make different varieties of
plants and animals.
Pure Breeding (true breeding) - correct answer ✔✔always producing the same type when
crossed with themselves or another individual. Ex. Red flower x red flower = red flower
Marfan's syndrome - correct answer ✔✔A dominant genetic disorder that causes a defect in
collagen and effects 1 in 5000 births
, Product Rule - correct answer ✔✔Multiplying the probability that two or more independent
events will both occur is the product of independent probability.
Ex. What is the chance that if you have two kids they both will be girls? 75%
What does it mean to be a carrier? - correct answer ✔✔To be heterozygous by containing both
the recessive allele and the dominant.
Addition rule - correct answer ✔✔when an outcome can be reached in more than one way you
add the probabilities of the independent way of reaching it
If a couple were to have 3 children what is the probability that 2 of them (and only 2 of them)
will be girls? - correct answer ✔✔Could happen in these 3 ways:
1. use the product rule
g g b = 1/2 x 1/2 x 1/2 = 1/8
g b g = 1/2 x 1/2 x 1/2 = 1/8
b g g = 1/2 x 1/2 x 1/2 = 1/8
2. use the addition rule
1/8 + 1/8 + 1/8 = 3/8
3. Answer is 3/8
Cystic fibrosis - correct answer ✔✔a recessive genetic disorder that effects 1/2000 births and
4% of all people are carriers
Porphyria - correct answer ✔✔inability to metabolize
Muscular Dystrophy - correct answer ✔✔the recessive and progressive loss of muscle function
which occurs almost always in males
answers graded to pass
Genetics - correct answer ✔✔the study on the basis of biological variability and how biological
characteristics are inherited
Who was the father of genetics and what did he study? - correct answer ✔✔Gregor Mendel and
he studied pea plants because they produce lots of offspring and can have lots of variation
What is Mendels Theory of Particulate Inheritance - correct answer ✔✔Inheritance is due to the
passing of particulate factors from one generation to the next in an unchanged form.
What controls traits? - correct answer ✔✔a pair of factors or genes
What is the Blending Theory of Inheritance and why is it wrong? - correct answer ✔✔It's the
theory that the characteristics of the parents are blended in the offspring. This is wrong because
not all children have all their characteristics soley from their parents.
What is the Doctrine of Fixity of Species and why is it wrong? - correct answer ✔✔It's the
doctrine that each species has a fixed and unchanging set of biological characteristics. This is
wrong because crossbreeding and inbreeding has been used to make different varieties of
plants and animals.
Pure Breeding (true breeding) - correct answer ✔✔always producing the same type when
crossed with themselves or another individual. Ex. Red flower x red flower = red flower
Marfan's syndrome - correct answer ✔✔A dominant genetic disorder that causes a defect in
collagen and effects 1 in 5000 births
, Product Rule - correct answer ✔✔Multiplying the probability that two or more independent
events will both occur is the product of independent probability.
Ex. What is the chance that if you have two kids they both will be girls? 75%
What does it mean to be a carrier? - correct answer ✔✔To be heterozygous by containing both
the recessive allele and the dominant.
Addition rule - correct answer ✔✔when an outcome can be reached in more than one way you
add the probabilities of the independent way of reaching it
If a couple were to have 3 children what is the probability that 2 of them (and only 2 of them)
will be girls? - correct answer ✔✔Could happen in these 3 ways:
1. use the product rule
g g b = 1/2 x 1/2 x 1/2 = 1/8
g b g = 1/2 x 1/2 x 1/2 = 1/8
b g g = 1/2 x 1/2 x 1/2 = 1/8
2. use the addition rule
1/8 + 1/8 + 1/8 = 3/8
3. Answer is 3/8
Cystic fibrosis - correct answer ✔✔a recessive genetic disorder that effects 1/2000 births and
4% of all people are carriers
Porphyria - correct answer ✔✔inability to metabolize
Muscular Dystrophy - correct answer ✔✔the recessive and progressive loss of muscle function
which occurs almost always in males
