Genetics Question Preview (ID: 38043)
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The phenotype of an organism
a) is its genetic makeup
b) occurs only in purebred organisms
c) cannot be identified
d) describes its physical characteristics
What is an individual that has 2 recessive alleles for the same trait called?
a) haploid for the trait
b) heterozygous for the trait
c) homozygous for the trait
d)
If 2 heterozygous parents are crossed, what is the expected phenotype ratio for their offspring?
a) 1:2:1
b) 2:1:1
c) 3:1
d) 4:1
Pink flowers are a result of crossing red and white flowers, what is this pattern of inheritance called?
a) complete dominance
b) genetic interaction
c) incomplete dominance
d) multiple alleles
Why are recessive sex-linked genes expressed more often in males?
a) males inherited these genes from their fathers
b) males always have two of these genes
c) all male offspring get the recessive gene from their fathers
d) males only receive one gene for that trait
Mutations that occur in these types of cells could be passed on to the organism without affecting the organism itself?
a) egg cells
b) skin cells
c) liver cells
d) alveoli
The expression of a trait such as eye color is influenced by many genes, what pattern of inheritance is this?
a) Codominance
b) Incomplete dominance
c) Complete dominance
d) Polygenic inheritance
What is the correct number of chromosomes in humans?
a) 2 pairs of sex chromosomes and 46 pairs of autosomes
b) 2 pairs of sex chromosomes and 23 pairs of autosomes
c) 1 pair of sex chromosomes and 46 pairs of autosomes
d) 1 pair of sex chromosomes and 22 pairs of autosomes
An organism's genotype is Ttss, which of the following combinations of alleles could have been found in one of the gametes that created this organism?
a) Tt
b) Ts
c) TS
d) Ss
What kind of chromosomal mutation is the most harmful?
a) deletion
b) frameshift mutation
c) point mutation
d) substitution
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