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Genetics 20 21 Flashcards | StudBud
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Genetics 20 21
Genetics 20 21
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Genetics
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29 cards
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Questions
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Answers
1
What is the approximate probability that a human offspring will be male?
25%
10%
75%
50%
2
The different forms of a gene contributed by each parent is called
an allele.
a recessive trait.
genetics.
a dominant trait.
3
What is the difference between a genotype and a phenotype?
Genotypes are alleles, phenotypes are traits.
Genotypes are heterozygous, phenotypes are homozygous.
Genotypes are recessive, phenotypes are dominant.
Geno. result from true-breeding, pheno. from fertilization.
4
Which of the following best summarizes the law of independent assortment?
A given gene will affect another gene during meiosis.
Traits on genes segregate during gamete formation.
Gametes are independent from assorted traits.
Probability can be used to calculate genetics.
5
What is the probability of rolling a dice and landing on 1?
1/6
1/2
1/4
2/3
6
In the F2 generation short plants reappeared because
F2 plants make gametes that carried the allele for shortness
the allele for shortness is dominant
allele for short&tall segregated when F1 plants made gametes
inherited 1 short, 1 tall allele from each parent
7
What will the genotype and phenotype be for the offspring in the gray shaded area?
rrYY; wrinkled/green
rrYy; wrinkled/yellow
rryy; wrinkled/yellow
rryy; wrinkled/green
8
Where are chromosomes found?
In alleles.
In the nucleus.
In the DNA.
In genes.
9
An organism possessing the alleles ff for freckles would be considered
heterozygous.
homozygous.
10
Is it possible to have the same phenotype with another person, but a different genotype?
Yes.
No.
11
The offspring of crosses between different parents are called
hybrids.
homozygotes.
true bred offspring.
clones.
12
Gregor Mendel concluded that traits are
determined by dominant factors only
not inherited by offspring
inheritedby the passing of factors from parents to offspring
determined by recessive factors only
13
How many different allele combinations are found in the gametes with genotype RrYy?
2
4
3
5
14
Each pea-plant has how many alleles for the height gene?
2
4
1
3
15
If a pea plant's alleles for height are tt, what is true of its parents?
both parents are tall, one is hetero the other homo
both parents contributed a dominant allele
both parents contributed a recessive allele
both parents were short
16
True breeding produces
genetically unique offspring.
a genetic hybrid.
offspring with identical DNA.
17
The principle of dominance states that
all alleles are recessive
some alleles are dominant and others are recessive
alleles are neither dominant nor recessive
all alleles are dominant
18
Gregor Mendel's principles of genetics applies to
pea plants only
all organisms
animals only
plants only
19
What is a gamete?
The term for the offspring between two different parents.
The result of true-breeding.
An alternate form of a gene.
An egg or sperm.
20
When Mendel crossed the F1 generation peas, he found that the recessive trait had disappeared.
True.
False.
21
What is the probability of flipping a coin 3 times and landing on heads 3 times in a row?
1/8
1/12
1/16
1/4
22
What was the genotype of the parents of these 16 offspring?
rryy.
RRYY.
round/yellow.
RrYy.
23
What does the term "homologous" mean?
Having the same genes at the same place on a chromosome.
Having the same parents (true-breeding).
Undergoing the same number of divisions.
Dividing at the same time.
24
A Tt pea plant is crossed with a short plant. the probability that an F1 plant will be tall
75%
25%
50%
100%
25
Organisms that have identical alleles for a particular trait are called
recessive.
hybrids.
heterozygous.
homozygous.
26
When Mendel crossed a tall plant with a short plant, the F1 plants inherited
an allele for tallness from each parent
an allele for shortness from each parent
they were true-breeding like their parents
tall allele from 1 parent & allele for short from 1 parent
27
The principles of probability can be used to
decide which organisms are best to use in genetic crosses
determine the actual outcomes in genetic crosses
predict traits of the offspring produced by genetic crosses
predict traits of the parents used in genetic crosses
28
A specific characteristic, such as color or size, is called
a trait.
a gene.
an allele.
DNA.
29
The likelihood that a particular event will occur is referred to as
Statistics.
Punnett Squares.
mathematics.
Probability.
