Download Genetics Practice Problems - Simple Worksheet

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Transcript
Genetics Practice Problems - Simple Worksheet
1.
For each genotype below, indicate whether it is Homozygous (Ho) / Dominant (D) or Recessive (R) /
Heterozygous (He) / Purebred (P) / Hybrid (Hb)
AA ________
ee __________
TT __________
Mm __________
Bb ________
Ff ___________
jj ___________
nn___________
2. For each of the genotypes below determine what phenotypes would be possible.
Purple flowers are dominant to
Brown eyes are dominant to blue
white flowers.
eyes
PP __________________
BB ________________
Pp __________________
Bb ________________
pp __________________
bb ________________
Round seeds are dominant to
wrinkled seeds.
Bobtails in cats are recessive.
RR __________________
Rr __________________
rr __________________
TT _________________
Tt _________________
tt __________________
3. For each phenotype below, list the genotypes (Use the letter of the dominant trait)
Straight hair is dominant to curly. Pointed heads are dominant to round heads
____ straight
_____ pointed
____ straight
_____ pointed
____ curly
_____ round
4. On the back of this handout, set up and complete Punnett Squares, then determine
the 3 Genotype percentages and 2 Phenotype percentages for each of the crosses listed
below.
Round seeds are dominant to wrinkled seeds.
What percentage of the offspring will be
Rr x rr
round? _______________
What percentage of the offspring will be
RR x rr
round? _______________
What percentage of the offspring will be
RR x Rr
round? _______________
What percentage of the offspring will be
Rr x Rr
round? _______________
Genetics Notes Review (Fill in the Blanks)
1. _________________________ refers to physical or visible characteristics that are studied in genetics.
2. _________________________ refers to the genetic makeup of an organism.
3. Factors that control traits are called ____________________________
4 The different forms of a gene are called _________________________
5. Scientists call an organism that has two different alleles for a trait _________________ or ______________.
6. Scientists call an organism that had two similar alleles for a trait _________________ or _______________.
7. To a geneticist, the notation rr means two __________________________ alleles
8. To a geneticist, the notation Rr means one ____________________ and one ____________ allele
9. __________________________is the likelihood that a particular event will occur.
10. An organism that has two identical alleles for a trait is ____________________________.
12. A heterozygous organism has two ______________________________ alleles for a trait.
13. Codominance or ________________ Dominance means the alleles are _______________________ dominant nor
recessive.
14. An example of Codominance between a red carnation and white carnation would result in a _____________
carnation.
15. Any change in a gene or chromosome results in a ______________________________.
16. A mutation may be _________________ , _____________________ or _____________________ to an organism.
17.
If a homozygous Red Feathered Cardinal (RR) is crossed with a homozygous Brown Feathered Cardinal (rr),
what is the probability that an offspring will be a Red Feathered Cardinal? __________%