BSC 1005 Unit 3 Exam || with 100% Correct Answers.
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Module
BSC 1005
Institution
BSC 1005
Who was Gregor Mendel and what did he discover? correct answers A 19th century Austrian monk who discovered the basic laws of genetics
What is the Blending Theory of Inheritance? correct answers The idea that the characteristics of each parent were somehow blended in the offspring, yielding an o...
BSC 1005 Unit 3 Exam || with 100% Correct Answers.
Who was Gregor Mendel and what did he discover? correct answers A 19th century Austrian monk who discovered the basic laws of genetics
What is the Blending Theory of Inheritance? correct answers The idea that the characteristics of each parent were somehow blended in the offspring, yielding an offspring intermediate between the two parents
What were the flaws of the Blending Theory of Inheritance as an explanation of heredity? correct
answers It predicted that offspring would ALWAYS be intermediate between theit parents; it doesn't explain how new traits appear
What is the Doctrine of the Fixity of Species? correct answers An idea, grounded in religious belief, that each species of animal and plant was created individually by God and was fixed and unchanging in its characteristics
What does Mendel's concept that "inheritance patterns were due to the passing of discrete particulate factors" mean? correct answers Each child receives some factors from one parent and some from the other
Whay are particulate factors now called? correct answers Genes
What are genes responsible for? correct answers A single trait
How are traits passed? correct answers They're passed on unchanged from one generation to the next during sexual reproduction
What is the Particulate Theory of Inheritance? correct answers Traits can be passed from generation to generation through "discrete particles" known as genes
How did Mendel test his Particulate Theory of Inheritance? correct answers By making deliberate sexual crosses between organisms that displayed different physical traits
What is a zygote? correct answers A fertilized egg
What is pollination? correct answers The transfer of pollen to the stigma (the female sexual reproductive organ of a flower)
Whay is cross-pollination? correct answers When pollen is being transferred from one plant to another
What are self-fertilizing plants? correct answers When the flowers of the plant do not open, so cross-pollination does not occur, thus forcing the flower to fertilize itself
Why are some plants inbred? correct answers Because they are self-fertilizing What happens to the offspring of inbred plants? correct answers They ate very genetically similar
and display all the same traits as their parents
What is inbreeding/inbred also called? correct answers Purebred or pure breeding
What happens when a plant is a hybrid? correct answers It displays a new mixture of traits
What is the first assumption of Mendel's Law of Random Segregation? correct answers Each trait
is controlled by a pair of genes
What are alleles? correct answers Genes that code for alternative forms of the same trait
How are dominant alleles represented? correct answers a capital letter
How are recessive alleles represented? correct answers a lower case letter
How would a purebred allele be represented? correct answers two capital letters or two lower case letters
How would a hybrid allele be represented? correct answers one capital letter and one lower case letter
What is the second assumption of Mendel's Law of Random Segregation? correct answers In each pair of alleles, one is dominant and the other is recessive
What is the third assumption of Mendel's Law of Random Segregation? correct answers In the formation of sex cells, each allele of a gene pair separates from the other allele in a random fashion; therefore each gamete receives only one of the two alleles
What does it mean when an organism is homozygous for a trait? correct answers when it carries two identical alleles for a certain trait (e.g. RR or rr)
What does is mean when an organism is heterozygous for a trait? correct answers when it carries two different alleles for the same trait (e.g. Rr)
What is a genotype? correct answers an organism's genetic make-up
What is a phenotype? correct answers the organism's physical appearance
What is a Punnett Square? correct answers a table that predicts the frequencies at which a genotype will occur
What is albinism? correct answers an abnormality in which the brown pigment melanin is not produced
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