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Biology 2: Genetics Basics Flashcards | StudBud
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Biology 2: Genetics Basics
Biology 2: Genetics Basics
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1
Which is an example of incomplete dominance?
cystic fibrosis
Huntington's disease
hemophilia
sickle-cell anemia
2
Which genotype represents a recessive trait?
PP
pp
Pp
curly hair
3
What is the
phenotypic
ratio of offspring when 2 heterozygous plants (Tt) for a certain trait are crossed?
100% dominant : 0% recessive
75% TT : 25% tt
25% TT : 50% Tt : 25% tt
75% dominant : 25% recessive
4
Recessive traits are expressed when an individual is homozygous.
True
False
5
What is an allele?
a gene that is expressed
a version of a gene
the centromere of the chromosome
the correct form a gene
6
Which statement is true of the plant offspring using the Punnett Square below?
100% of the offspring will be heterozygous dominant
50% of the offspring will be short
100% of the offspring will be tall.
75% of the offspring will be tall.
7
Which statement is true of a plant with genotype TT and another with genotype Tt?
both have the same phenotype
they would have different phenotypes
they are both homozygous
they are both heterozygous
8
What is the
genotypic
ratio of offspring when 2 heterozygous plants (Tt) for a certain trait are crossed?
25% TT : 50% Tt : 25% tt
100% dominant : 0% recessive
75% TT : 25% tt
75% dominant : 25% recessive
9
The process of meiosis ensures that each gamete:
carries one copy of each gene (excepting sex-linked genes)
carries only dominant or recessive alleles
is more likely to carry dominant alleles
contains a diploid assortment of genes for fertilization
10
If one parent has Type AB blood and the other has Type O blood, what blood types can their children have?
Type AB, A, B, or O (any blood type)
Type A and Type B
Type AB only
Type AB and Type O
11
If parents are Yy and Yy, what percent of offspring would have the same phenotype as their parents?
100%
50%
75%
25%
12
What is the best definition of genotype?
an individual's alleles for a given trait
the physical appearance of an organism
13
Which condition occurs more commonly in males?
cystic fibrosis
hemophilia
sickle-cell anemia
Huntington's disease
14
What are the parents of the punnett square below?
Tt, Tt
tt, tt
tt, Tt
TT, tt
15
An injured person has type A blood. What blood types can they receive?
Type A only
Type A and AB
Type A and O
Type A, AB and O
16
What
genotypes
are possible for offspring of a homozygous dominant parent and a recessive parent?
Only homozygous recessive
Only homozygous dominant
Only heterozygous
All genotypes are possible
