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Genetics Test
Shrum's 2nd Period Biology Class
| Question | Answer |
|---|---|
| Which disease most likely occurs after excessive exposure to ultraviolet radiation? | skin cancer |
| What is the approximate probability that a human offspring will be female? | 50% |
| Colorblindness is more common in males than in females because | the allele for colorblindness is located on the Y chromosome |
| Which of the following combinations of sex chromosomes represents a female? | XX |
| Which of the following is caused by a dominant allele? | Huntington's Disease |
| Compared to normal hemoglobin of a person with sickle cell disease | is sickle shaped |
| Which process produces the most variation within a species? | sexual reproduction |
| One of the parents of a child has PKU, which is caused by 2 recessive alleles. The other parent does not have any PKU alleles. What is the chance that the couple will have a child with PKU? | 0% |
| Which set parents can most likely produce a child with type 0 blood? | one parent with heterozygous type A blood and the other parent with type 0 blood |
| The inheritance of short wings in fruit flies is an x-linked recessive trait (sex-linked). Which would most likely result if a short winged female mates with with a long winged male? | All the females will be long winged and all the males will be short winged. |
| Which chromosomes in the karotype above are autosomes? | (11. Picture) 1-22 |
| In a human karyotype above, how many chromosomes total are shown? | (12. Picture) 47 |
| Identify the sex of the individual above. | (13. Picture) male |
| This condition is called | (14. Picture) down syndrome |
| Hitchhiker's Thumb (H) is dominant to no hitchhiker's thumb (h). A woman who does not have hitchiker's thumb marries a man who is heterozygous for hitchhiker's thumb. What is the probable genotypic ratio of their children? | 50% Hh : 50% hh |
| Several matings between the same black guinea pig and female brown guinea pig produce a total of 12 brown and 14 black guinea pigs. If black is dominant to brown, what are the genotypes of the parents? | Bb x bb |
| Some flowers show incomplete dominance. If WW = white and RR = red, which phenotypic ratio would be expected in the offspring of 2 pink flowers? | 1 red: 2 pink: 1 white |
| In a particular species of plants, when the soil pH is greater than 7, blue flowers are produced. However, when the soil pH is less than 7, pink flowers are produced. Which statement best explains the color change in the plant? | the environment influences the expression of the gene for the flower color |
| A fertilized egg cell contains genes from both parents is called a | zygote |
| Attached earlobes are recessive to free earlobes. What is the probability of having a child with attached earlobes when an individual with attached earlobes mates with an individual heterozygous for that trait? | 50% |
| Who noticed that patterns of inheritance were predictable? | Gregor Mendel |
| Why do identical twins become less alike as they grow older? | Because the environment plays a role in influencing individuals |
| This chart shows the result of several crosses with white-feathered chickens and dark-feathered chickens. Which cross would be represented as Aa x aa, where A represents a dominant allele and (a) represents a recessive allele? | (23. Picture) Feather colors - White x Dark; 50% White, 50% Dark |
| Is individual 2 homozygous or heterozygous for free earlobes? Free earlobes are dominant to attached | (24. Picture) heterozygous |
| How many children of individuals 4 and 5 have attached earlobes? | (25. Picture) 0 |
| Predict the genotype of individual 14 | (26. Picture) ff |
| monohybrid | cross looking at the alleles of 1 trait |
| incomplete dominance | neither allele is dominant over the other so they blend together |
| codominance | both alleles show up |
| sex-linked | dependent upon the gender of the individual |
| karotype | a picture of all a person's chromosomes |
| pedigree | shows how traits are inherited in a family |
| test cross | crossing a known genotype with an unknown genotype to predict the unknown genotype |
| carrier | another word for heterozygous |
| The diagram below depicts a process that occurs during meiosis. Which would be the result of the process? | (29. Picture) an increase in genetic variety |
| If the diploid number of chromosomes of a dog is 78, how many chromosomes would be in each gamete at the end of meiosis? | 39 chromosomes |
| Black hair color is dominant to white hair color in mice. Interpret the Punnett square below to determine the expected phenotypic ratio for the offspring of a homozygous black mouse and a white mouse. | (31. Picture) 4 Black: 0 White |
| How can poor nutrition lead to a change in trait expression? | by changing phenotype |
| Color blindness is inherited as a sex-linked recessive disease. An affected male marries a female who is heterozygous for the trait. What percentage of their offspring will exhibit color blindness. | 50% |
| A father without hemophilia has two daughters and two sons. Neither daughter has hemophilia. One son has hemophilia and the other does not. What is the genotype of the mother? | XHXH - H's are superscripted |
| The ABO blood group has three different alleles: IA, IB, and i. The genotypes and phenotypes (blood types) for different combinations of the three alleles are shown in the table. | (Possible Genotype and Phenotypes of ABO Blood Group Chart) - What percentage of offspring from a cross between a homozygous Type A parent with a herterozygous Type A parent is expected to contain the i allele? 50% |
| Two heterozygous tall plants (Tt) are crossed. What are the expected genotypes and percentages of this cross? | TT 25%; Tt 50%; tt 25% |
| Tay-Sachs disease is a lethal, austosomal recessive genetic disorder. If both parents are heterozygous carriers of the disease, what are the chances of them having a child who is also a heterozygous carrier for Tay-Sachs? | 50% |
| Which of the following is an example of sex-linked inheritance? | hemophilia |
| Two heterozygous tall plants (Tt) are crossed. What are the expected genotypes and percentages of this cross? | TT 25%; Tt 50%; tt 25% |
| In fruit flies, red eyes are dominant over sepia eyes. Half of their offspring have sepia eyes and half have red eyes. What does this indicate about the flies that were crossed? | The male is hertozygous and the female is the homozygous recessive for the trait. |
| Scott was looking at the results of a cross between red and white flowers. Which is the MOST likely result of a cross that demonstrates incomplete dominance? | 100% pink flowers |
| In guinea pigs, rough coats )R) are dominant to smooth coats (r). A homozygous rough-coat guinea pig has offspring with homozygous smooth-coat guinea pig. What percent of the offspring are predicted to have rough coats? | 100% |
| Which of the following is an example of sex-linked inheritance? | hemophilia |
| Having freckles is dominant over not having freckles. If two individuals heterozygous for freckles have a child, what is the probability the child will have freckles? | 75% |
| What is the chance of two parents with blood types AB and O producing an offspring with blood type O? | 0% |
| Biologists have found that a form of deafness in a recessive trait in dogs. If a female dog that is heterozygous for the trait mates with a male dog that is deaf, what percent of their offspring will be deaf? | 50% |
| Cystic fibrosis is a lethal, autosomal recessive genetic disorder. Which statement BEST explains how cytic fibrosis is maintained in the gene pool? | Organisms that are heterozygous can pass on either dominant or recessive alleles. |
| A father without hemophilia has two daughters and two sons. One son has hemphilia and the other does not. What if the genotype of the mother? | XHXH (Hs are superscript) |
| A student created the table below which shows different traits that are affected by genetics and the environment. | (49. Picture) - blood type |
| Black hair color is dominant to white hair color in mice. Interpret the Punnett square below to determine the expected phenotypic ratio for the offspring of a homozygous black mouse and a white house. | (50. Picture) 4 Black: 0 White |
| Color blindness is inherited as a sex-linked recessive disease. An affected male marries a female who is heterozygous for the trait. What percentage of their offspring will exhibit color blindness? | 50% |
| Tay-Sachs disease is a lethal, autosomal recessive genetic disorder. If both parents are heterozygous carriers of the disease, what are the chances of them having a child who is also a heterozygous carrier for Tay-Sachs? | 50% |
Created by:
kelly.rierson
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