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Mendelian Genetics
Mendelian Genetics
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Mendelian genetics Basic biology
Flashcards
25 cards
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Practice quiz
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Questions
25
Answers
1
In a gene, these are the different forms:
Alleles
Genes
Parents
Offspring
2
Why can an individual with the genotype AaBbCCDdEE make many kinds of gametes?
the tendency for dominant alleles to segregate together
segregation of maternal and paternal alleles
crossing over during prophase I
different possible assortment of chromosomes into gametes
3
Alleles from different genes usually segregate TOGETHER when gametes form.
FALSE
TRUE
4
Why did Mendel continue his experiments to the F
2
generation?
to determine whether or not the dominant trait would appear
to obtain a large number of offspring on which to base his statistics
to distinguish which alleles were segregating
to observe whether or not a recessive allele trait would appear
5
What type of inheritance pattern is shown in this cross?
Codominance
Multiple Alleles
Incomplete Dominance
Polygenic traits
6
What type of inheritance pattern is shown in this cross?
Incomplete Dominance
Multiple Alleles
Codominance
Polygenic traits
7
In the image below, "Aa" is the moth's _______________.
Phenotype
Genotype
Homozygous trait
Trait
8
When we say the flowers are purple, we are describing the _________.
Neither
Phenotype
Both
Genotype
9
What can be determined with a pedigree?
predict probability of a certain trait
family history of a particular trait
all of the above
predictions of future offspring
10
What was the most significant conclusion that Gregor Mendel drew from his experiments with pea plants?
There is considerable genetic variation in garden peas.
Recessive genes occur more often in the F1 generation than do dominant.
Traits are inherited in units and are not the "blending" of traits.
organism that is homozygous for many recessive traits is at a disadvantage.
11
Which is correct about the difference between law of independent assortment and law of segregation?
LS explains the segregation of two or more genes relative to one another
IA explains the segregation of two or more genes relative to one another
LS is accounted for by anaphase of mitosis
LS requires having two or more generations to describe
12
In this Punnett Square, what percentage of offspring are homozygous recessive?
25%
50%
100%
75%
13
Why did the F
1
offspring of Mendel's pea cross always look like one of the parents?
One allele was dominant
The traits blended together during fertilization
Each allele affected phenotypic expression
No genes interacted to produce the parental phenotype
14
In the Punnett square shown, how many offspring show dominant phenotypes for BOTH TRAITS?
4
9
3
16
15
In order for a recessive trait to be expressed, the genotype needs to be________.
Heterozygous recessive
Homozygous dominant
Heterozygous dominant
Homozygous recessive
16
When a gene at one locus alters the phenotypic expression of a gene at another locus
epistasis
multiple alleles
codominance
incomplete dominance
17
This allele is expressed no matter which other allele is in the pair.
Genotype
Dominant
Recessive
Phenotype
18
Which term best describes the genotype indicated by the ARROW?
Heterozygous
All are correct
Homozygous recessive
Homozygous dominant
19
"Pp" for purple flowers is the _______________.
Phenotype
Genotype
20
When Mendel cross-bred pea plants, first generation of offspring was called ______.
F1
Parents
P1
F2
21
An organism's physical traits are its...
Genotype
Alleles
Genes
Phenotype
22
In order for a dominant trait to be expressed, the genotype can be________.
Homozygous dominant
Heterozygous recessive
Homozygous recessive
Hemizygous
23
Organisms that have two identical alleles for a gene.
Recessive
Heterozygous
Homozygous
Dominant
24
What determines traits?
Genes
Parents
Phenotype
RNA
25
Organisms that have two different alleles for a gene.
Dominant
Homozygous
Heterozygous
Recessive
