BIOL 202 Lecture Notes - Lecture 17: Gamete, Centromere, Haploinsufficiency
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1. A mother with blood type A has a child with blood type A. Give all possible blood types for the father of this child.
| a.) O | |||||||||||||||||
| b.) B, AB | |||||||||||||||||
| c.) A, AB | |||||||||||||||||
| d.) A, B, O | |||||||||||||||||
| e.) A, B, AB, O 2.) In sesame, the one-pod condition (P) is dominant to three-pod (p), and normal leaf (W) is dominant to wrinkled (w). These characteristics assort independently. A one-pod, wrinkled leaf à one-pod, normal leaf cross gave a progeny of 654 one-pod, normal leaf plants and 224 three-pod, normal leaf plants. What are the likely genotypes of the parents in this cross?
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3.) Honeybees have a haplo-diploid sex determination system where females develop from a fertilized egg (they are diploid, having one allele from the female queen and one allele from the male), and males develop from unfertilized eggs (they are haploid, having only one allele from the queen). Assuming that the queen is heterozygous for a particular gene, what is the probability that a female will inherit the recessive allele from her mother? What is the probability that a male will inherit a recessive allele from his mother?
| a.) The probability that a daughter will inherit a recessive allele from her mother is 50%; the probability that a son will inherit a recessive allele from his mother is 100%. | ||
| b.) The probability that a daughter will inherit a recessive allele from her mother is 100%; the probability that a son will inherit a recessive allele from his mother is 50%. | ||
| c.) The probability that a daughter will inherit a recessive allele from her mother is 50%; the probability that a son will inherit a recessive allele from his mother is 50%. | ||
| d.) The probability that a daughter will inherit a recessive allele from her mother is 100%; the probability that a son will inherit a recessive allele from his mother is 100%. |
4.) Human males, with XY chromosomes are _____ and produce two different kinds of gametes, whereas females with XX chromosomes are _____ and produce only one kind.
| a.) | homogametic; heterogametic | |
| b.) pleiotropic: epistatic | ||
| c.) heterogametic; homogametic | ||
| d.) epistatic; pleiotropic |
5.) A chi-square test is done to test the hypothesis that a set of data represents a F2 ratio of 9:3:3:1. The degree(s) of freedom that should be used is:
| a.) 1 | ||
| b.) 2 | ||
| c.) 3 | ||
| d.) 4 I DON'T KNOW HOW TO DO THESE PROBLEMS, I WOULD REALLY APPRECIATE SOME HELP AND EXPLANATION ON HOW TO WORK OUT THESE PROBLEMS. THANK YOU VERY MUCH!!! |
Genetics
I dont really understand this
Please explain your answer!
Suppose you have two species of corn. One has sweet kernels and the other has large ears. Both have 20 chromosomes, each of which is homologous in both species. Suppose you want to create a hybrid that has both characteristics of sweet kernels and large ears, so you cross individuals from the two species. The initial hybrid you obtain has 20 chromosomes, but then you establish a viable tetraploid (4n) individual with 40 chromosomes. Which of the following could best explain this observation?
| A | Nondisjunction of a single chromosome caused the doubling of the genome. | |
| B | The initial F1 hybrid was unable to produce normal haploid gametes and instead produced diploid gametes. As a result, self-fertilization created progeny with 40 chromosomes. | |
| C | The original F1 hybrid was able to produce normal gametes, thus, the tetraploid was formed by fusing one normal haploid gametes with an abnormal diploid gamete. | |
| D | Nondisjunction of a random set of chromosomes produced abnormal gametes, and thus the 40 chromosomes represent a random assortment of chromosomes from the two parents. | |
| E | None of the above can explain the phenomenon. |
