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Principles Of Genetics Quiz 4 (30 MCQs)

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1. A man and a woman who are both heterozygous for normal skin pigmentation (Aa) produce an albino offspring (aa). Which of Mendel's principles explain(s) why the offspring is albino?
2. A dihybrid trait crosses .....
3. A dihybrid cross (AaBb x AaBb) will result in what offspring ratio?
4. A cell that has two complete sets of chromosomes (one from each parent) is called ..... and abbreviated as .....
5. What traits could scientists potentially manipulate by genetically engineering human babies.
6. In mice coat color is incompletely dominant. Black and white are homozygous. Brown mice are heterozygous.What is the genotype for a brown mouse?
7. A ..... is the specific genetic makeup or "code" for a particular trait.
8. States that allele pairs separate or segregate during gamete formation and randomly unite at fertilization
9. Which phrase best describes the outcome of meiosis?
10. A father is heterozygous for his type A blood and a mother is heterozygous for her type B blood. What percentage of their offspring would you expect to have?
11. The X-linked recessive trait of color-blindness is present in 5% of males. If a mother who is a carrier and father who is unaffected plan to have children, what is the probability of having a male who is color-blind?
12. In human beings, which parent determines the sex of the offspring
13. Which pair of alleles shown below are both RECESSIVE ALLELES?
14. In a punnet square where are the parent alleles written?
15. What law states that in Tt the person will only show the dominant allele
16. In a certain species of insect, eye color is controlled by a single gene. The dominant allele (E) codes for black eyes, while the recessive allele (e) codes for red eyes. How could two parents with black eyes have a red-eyed female offspring?
17. In a species of mouse, brown fur (B) is dominant over white fur (b). If a heterozygous brown mouse is crossed with a white-colored mouse, what would be true of their possible offspring?
18. Micrograph of the complete diploid set of chromosomes grouped together in pairs, arranged in order of decreasing size
19. Which type of plant did Gregor Mendel use to conduct a large portion of his research?
20. What is the major difference between a genotype and a phenotype?
21. A pea plant is heterozygous for height (Tt) and it is crossed with a homozygous short (tt) plant. Use a Punnett square to determine the probability of one of their offspring being short.
22. Brown hair (B) is dominant to blonde hair (b). Cross a homozygous dominant hair colored person with a homozygous recessive hair colored person. What percentage of their children will have brown hair?
23. Round (R) seeds are dominant to wrinkled (r) seeds.What is the genotype for a homozygous dominant offspring?
24. A person heterozygous for wet earwax (Ww) mates with a person homozygous recessive for dry earwax. What is the chance their baby is heterozygous?
25. Chromosomes form tetrads during
26. Mendel's Law of independent assortment
27. In guinea pigs, short fur (S) is dominant to long fur (s) and brown fur (B) is dominant to white fur (b). A Heterozygous brown guinea pig with long fur is crossed with a white guinea pig that is heterozygous for short fur. What is the probability that the offspring will be brown with long fur?
28. What is another name for heterozygous?
29. Different forms of the same gene
30. When an organism has two different alleles, it is called
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