Transcription of Non-Mendelian Inheritance -- Practice Problems
1 Non-Mendelian Inheritance Practice Problems Work must be neatly done!! Be sure to make dominant and recessive alleles clearly distinguishable. punnett squares should show genotypes and you should summarize the phenotypes based on what the question is asking. 1. In plants known as four o'clocks , the allele for the dominant red flower colour is designated as F'. and is incompletely dominant over the allele for white flowers f'. A horticulturist allows several heterozygous pink flowered four o'clocks to self-pollinate and collects 200 seeds. Draw a punnett square for the cross and then identify the flower colour phenotypes and theoretical percentage, and number of plants expected from these seeds.
2 F F' Genotype Ratio Percentage Seeds F FF FF' Pink 2 50% 100. F' FF' F'F' Red 1 25% 50. White 1 25% 50. 2. In mice yellow coat colour is carried by the dominant allele Y' and white fur colour is carried by recessive y' allele. A research lab mates 10 heterozygous mice, and among the offspring, 42 have yellow fur and 19 have white fur. a. Draw a punnett square for the cross that shows this cross. Y y Yy Y YY. (yellow). Yy yy y (yellow) (white). b. Why do the phenotypes reflect a 2:1 ratio rather than a 3:1 ratio result from this cross? When the genotype is homozygous dominant, it is lethal so the dominant phenotype is only represented by heterozygous individuals.
3 3. In rabbits, white coat colour (CW) and black coat colour (CB) are codominant, and both of these alleles are dominant over the third possible allele, albino (c); heterozygotes (CWCB) are spotted black and white. Draw a punnett square that shows the genotypes and summarize the phenotypes of the offspring from a homozygous black-coated rabbit and a homozygous white-coated rabbit? CW CW. CB CB CW CB CW. CB CB CW CB CW. 4. In humans, the alleles for blood type are designated IA (A-type blood), IB (B-type blood) and i (O-type blood). What are the expected frequencies of phenotypes (percentage) in the following matings?
4 Create a punnett square for each to show the possible genotypes. Remember to use consistent notation when assign you dominant and recessive alleles in your punnett square . a. heterozygous A-type x heterozygous B-type b. IAIB x IAi IA i IA IA IA IA i IB IA IB IB i Type A = 50%. Type AB = 25%. Type B = 25%. c. IAIA x IBIB. IB IB. IA IA IB IA IB. IA IA IB IA IB. Type AB = 100%. d. AB x O. i i IA IA i IA i IB IB i IB i Type A = 50%. Type B = 50%. 5. Blood type analysis is used frequently as evidence in paternity suits. Consider the following hypothetical cases Exonerating presented in the table. blood type(s). Mother Child (A, B, AB or O).
5 The blood type of the mother and child are given. A O IA IB, IAIA, IBIB. B AB ii, IBIB, IBi Indicate which blood type(s), if any, of an accused man O O AB, IBIB, IAIA. would exonerate him as the father. B B IAIA. Exonerate = NOT the father A B IAIA. Blood Type Practice questions Be sure to use proper designation of alleles (IA, IB or i) where called for This will not be collected I. Identify the Characteristics of the Different Blood Groups Blood Type(s) of Type(s) of group antigen on cells antibody in serum A _____ _____. B _____ _____ Remember: possible antigens are A' and B . O _____ _____ Remember: antibodies are anti-A' or Anti-B'.
6 AB _____ _____. Which blood groups are considered the "universal donor" and "universal recipient?". Explain why these blood groups are so designated II. Identify the characteristics of the Alleles for Blood Type Determination Allele Expression This allele creates Allele (CoDom or Rec) which antigen on cell IA _____ _____. B. I _____ _____. i _____ _____. III. Identify the Genetics of Blood Type Determination What are the possible genotypes Blood type of persons with this blood type A _____. B _____. AB _____. O _____.
