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Worksheets5C Review
Total questions: 10
Worksheet time: 37mins
The alleles must separate when gametes are formed
Trait
The Law of Segregation
Allele
Homozygous
Having two identical alleles for a given gene; homozygous dominant (RR), homozygous recessive (rr)
Trait
The Law of Segregation
Allele
Homozygous
Having two different alleles for a given gene.
Heterozygous
The Law of Independent Assortment
Molecular genetics
Cross
An organism's physical appearance, or visible traits.
P1 generation
Gene
Genotype
Phenotype
An organism's genetic makeup, or allele combinations.
P1 generation
Gene
Genotype
Phenotype
What are dominant traits?
Traits that are expressed when an individual has no copies of the dominant allele.
Traits that are expressed when an individual has at least one copy of the dominant allele.
Traits that are expressed when an individual has at least one copy of the recessive allele.
Traits that are expressed when an individual has two copies of the dominant allele.
What are recessive traits?
Genetic traits that are only expressed when an individual has one copy of the recessive allele.
Genetic traits that are always expressed regardless of the number of copies of the recessive allele.
Genetic traits that are only expressed in males.
Genetic traits that are only expressed when an individual has two copies of the recessive allele.
This is a cross between heterozygous tall pea plants. Tall (T) is dominant to short (t). What fraction of the offspring do you predict will be tall?
1/4
2/4
3/4
4/4
In the problem shown, what must be the genotype of the missing parent?
BB
Bb
bb
Having freckles is a dominant trait in humans. A girl has freckles, but her brother does not. What do we know for certain about the parents?
both parents have at least one recessive allele
both parents are heterozygous for freckles
one of the parents does not have freckles
