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Genetics 2nd final

Biology 2nd semester final

QuestionAnswer
Why is it a good thing that Mendel studied inheritance using traits such as flower color instead of traits like human color? Mendel said that pea plants are easier to test than human skin color. It is also because human skin can change to the environment.
What occurs in Meiosis that allows new traits to appear? Crossing- Over
One child may inherit an allele for blood group A and an allele from blonde hair from Dad, while his sibling may inherint an allele from blood group A and an allele for brown hair from dad. This can be explained by the principle... Independent Assortment
Given a plant with 2 flower alleles R= red, W= white. The following are possible genotypes, with their phenotypes BR. RR= Red, RW= pink, WW= white. Because of the pollen falling off of the stamen. So it creates a new seed.
A capital letter means it is a Dominant gene
What do we call the trait that remains hidden? Recessive trait
What do we use to show the possible gene combinations? Punnett square
What is another word for Characteristics? Traits
Plants that reproduce by self pollination have Both male and female parts
Gregor Mendel used pea plants to study The inheritance of traits.
Gregor Mendel removed the male parts from the flowers of some plants in order to Both male and female
Gregor Mendel concluded that traits are The inheritance of traits
When Gregor Mendel crossed a true- breeding tall plant, with a short plant the F1 plants inherited Prevent self-pollination
The principle of dominance Some alleles are dominant and others are recessive
Organisms that have two identical alleles for a particular trait are said to be Homozygous
When Gregor Mendel crossed true breeding tall plants with true breeding short plants, all the offsprings were tall because The allele for tall plants is dominant
According to the principle of segregation when gametes are produced Allele pairs seperate from each other
If you made a punnett square showing Gregor Mendel's cross between true breeding tall plants and true breeding short plants, the square would show that the offspring had Genotype that was different from that of both parents
A cross of a brown cox (BB) with a white cow (WW) produces all offsprings with white and brown splotches (BBWW). This type of inheritanceis known as.. Codominance
Gametes are produced by... Meiosis
You wish to determine whether a tall pea plant is homozygous or heterozygous for tallness. What cross should you perform to arrive at your answer? Explain your choice of cross. You cross it with the heterozygous tall pea plant, because if you cross that than 1/4 of them will be short.
Having Freckles (F) is completely dominant to not having freckles (f). If two heterozygous individuals produce offspring, what ratio of the offspring will be freckled? 3/4
Having Freckles (F) is completely dominant to not having freckles (f). If two heterozygous individuals produce offspring, what ratio of the offspring will be dominant? 1/4
Mendel based his principles of his observations of pea plants.. True/False? True
The Scientific study of heredity is called genetics.. True/False True
In Mendel's experiments with the flower color of pea plants, only the parental generation produced white flowers.. True/False False
A dominant allele masks the effect of a recessive allele.. True/False True
The physical appearence of an individual organism, as determined by the genes it has inherited from its parents is called its genotype. True/False False
Individuals must exhibit a trait in order for it to appear in their offspring.. True/False True
In codominance, 2 alleles are expressed at the same time. True/False False
A probability of 1/4 is equal to a probability of 75%. True/False True
The phenotype of an organism... Reflects all the traits that are actually expressed
If an individual has two recessive alleles for the same trait, the individual is said to be.. Homozygous for the trait
All of the offspring resulting from a cross between a red snapdragon and a white snapdragon are pink. This is an example of... Incomplete dominance
Tallness (T) is dominant to shortness (t) in pea plants. Which of the followingrepresents a genotype of a pea plant that is heterozygous for tallness.. Tt
A cross of two individuals for a single contrasting trait is called.. Monohybrid
Created by: tatummilo333
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