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WorksheetsMendelian Genetics
Total questions: 10
Worksheet time: 8mins
A plant with purple flowers is allowed to self-pollinate. Generation after generation, it produces purple flowers. This is an example of
law segregation
true-breeding
incomplete dominance
hybridization
Which of the following statements about Mendel's breeding experiments is correct?
None of the parental (P) plants were true-breeding.
All of the F2 progeny showed a phenotype that was intermediate between the two parental (P) phenotypes.
Half of the F1 progeny had the same phenotype as one of the parental (P) plants, and the other half had the same phenotype as the other parent.
All of the F1 progeny resembled one of the parental (P) plants, but only some of the F2 progeny did.
What is the difference between a monohybrid cross and a dihybrid cross?
A monohybrid cross involves a single parent, whereas a dihybrid cross involves two parents.
A monohybrid cross produces a single progeny, whereas a dihybrid cross produces two progeny.
A monohybrid cross involves organisms that are heterozygous for a single character, whereas a dihybrid cross involves organisms that are heterozygous for two characters.
A monohybrid cross is performed only once, whereas a dihybrid cross is performed twice.
A cross between homozygous purple-flowered and homozygous white-flowered pea plants results in offspring with purple flowers. This demonstrates
the blending model of genetics.
true-breeding.
dominance.
a dihybrid cross.
The F1 offspring of Mendel's classic pea cross always looked like one of the two parental varieties because
one allele was completely dominant over another.
each allele affected phenotypic expression.
the traits blended together during fertilization.
no genes interacted to produce the parental phenotype.
Which of the following is (are) true for alleles?
They can be identical or different for any given gene in a somatic cell.
They can be dominant or recessive.
They can represent alternative forms of a gene.
all are true
Two plants are crossed, resulting in offspring with a 3:1 ratio for a particular trait. This suggests
that the parents were true-breeding for contrasting traits.
incomplete dominance.
that a blending of traits has occurred.
that the parents were both heterozygous.
A 9:3:3:1 phenotypic ratio is characteristic of which of the following?
a monohybrid cross
a dihybrid cross
a trihybrid cross
linked genes
A sexually reproducing animal has two unlinked genes, one for head shape (H) and one for tail length (T). Its genotype is HhTt. Which of the following genotypes is possible in a gamete from this organism?
HT
Hh
HhTt
tt
When crossing a homozygous recessive with a heterozygote, what is the chance of getting an offspring with the homozygous recessive phenotype?
0%
25%
50%
75%
