Download Ch 14 WS - LHSIBBiology

Name _____________________________
Chapter 14: Mendel and the Gene Idea Worksheet
1. __________________________ is a disease in which the brain fails to develop during
infancy but can be overcome by proper diet.
2. An allele that is fully expressed in the organism’s phenotype is known as the
_________________________ allele.
3. A ___________________________ individual has two alleles that are different.
4. The study of how characteristics are transmitted from parents to offspring is known as
______________________.
5. ABO blood grouping is an example of _________________________________ traits.
6. ________________________________ is known as the father of genetics.
7. ___________________________ is a disorder that does not allow blood to clot.
8. A cross between individuals that involves one trait is known as a
__________________________ cross.
9. Mendel’s two famous laws were:
1. _____________________________________________________
2. _____________________________________________________
10. When there is _______________________ dominance, only the dominant allele for a
gene is expressed in a heterozygote.
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11. Mendel’s law stating that each allele pair segregates independently during meiosis is
known as the _______________________________________________.
12. The appearance of an organism as a result of its genotype is its _________________.
13. Is being tall an example of a phenotype of genotype? _________________________
14. Give an example of a genotype that is homozygous recessive. ________________
15. An allele that is masked and has no noticeable effect on the organism’s appearance is
known as the _____________________ allele.
16. ________________________ is a disease that causes deterioration of the central
nervous system during infancy.
17. The genetic makeup of an organism is its __________________________.
18. The offspring of the P generation is known as the ________ generation.
19. ________________________________________ can give earlier results in the
pregnancy about genetic disorders than can ________________________________.
20. When there is ____________________________ dominance, the heterozygote
has a phenotype that is intermediate between the dominant and recessive phenotypes.
21. A ________________________ cross is a cross between individuals that involves
two traits.
22. ___________________________ is a disease in which the lungs, liver, and pancreas
get clogged by mucus.
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23. A ________________________________ is used to determine the genotype of an
unknown individual.
24. ___________________________ is when one gene alters the expression of another
gene that is independently inherited.
25. A ___________________________ individual has two alleles that are the same.
26. __________________________________ is caused by the substitution of the wrong
amino acid in hemoglobin.
27. Alternative forms of genes are known as ________________________.
28. Mendel’s law stating that allele pairs separate during meiosis is known as the
_____________________________________________.
29. When there is ___________________________ both alleles for a gene are expressed
in a heterozygote.
30. The ability of a single gene to have multiple phenotypic effects is called
____________________________.
31. Skin color is an example of ___________________________ inheritance.
32. ______________________________ is a disease that affects individuals in their 30’s
and 40’s.
33. During incomplete dominance the phenotypic ratio of the F2 generation of a
monohybrid cross is ________________.
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Problems:
1. Dick and Jane are both carriers for sickle cell anemia. What is the probability that
their first child will sickle cell anemia?
2. In roses there is incomplete dominance between red (RR) and white (rr). If you cross
a red and a pink flower what proportion of the offspring will be pink?
3. Red roses are dominant to white roses and tall roses are dominant to short roses. If
you cross RrTT x Rrtt, what proportion of the offspring will be white and tall?
4. A man that is A Rh negative is married to a woman that is B Rh positive. They have
one daughter that is O negative another daughter that is O positive, and a son that is A
negative. List the genotypes of each member of the family.
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5. Given the parents aaBbcc x AaBbCc, what proportion of the offspring will look like
the second parent?
6. A couple, who neither one have hemophilia, has a child. The child has hemophilia.
However, the couple wants two more children. What is the probability that both
children will have hemophilia?
7. How many unique gametes could be produced through independent assortment by an
individual with the genotype AABbCcDDEe?
8. In a cross between AaBbCCDd x aaBbCcdd, what is the probability of producing the
genotype AaBBCcdd?
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