BIOL 121 Study Guide - Midterm Guide: Mendelian Inheritance, Metaphase, Zygosity

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BIOL 121 Full Course Notes

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An f1 plant with the genotype aa bb was produced by crossing two pure-breeding parents with the genotypes aabb and aabb. Crossing over did not occur of the f1 plants if: How many different gametes are possible if crossing over occurs once: if you cross the f1 heterozygote from a) above with the homozygous recessive parent aabb, explain why you get the following numbers of offspring: In a diploid organism 2n = 6, and there are two long, two intermediate, and two short chromosomes. Select the correct answer and explain why each of the incorrect answers is incorrect. Question 3 (8 marks) mendel also took pea plants that were homozygous for two genes on different chromosomes, for tall height and purple flowers (hhff) and crossed them with homozygous recessive short plants with white flowers (hhff). Place the alleles on the respective chromosomes. (4 marks)

Related Questions

7. When a pea plant of genotype Aa Bb produces gametes whatproportion will be ab?

8. Hamsters are long haired if they have the genotype LL or Ll andthey are short haired if they have the genotype ll. A long hairedhamster is mated with a short haired hamster. Half of the offspringare long haired and half are short haired. This allows us toconclude that the long haired parent hamster is? D

9. In peas yellow seed (Y) is dominant over green seeds (y) andtall plant (T) is dominant over short plant (t) .Calculate theprobability of the genotypes and phenotypes. in the F2 generationof a dihybrid cross that begins when a dominant homozygote iscrossed with a recessive homozygote. You must show the all of theprobability calculations. D

10. In a fruit fly experiment, two gray-bodied fruit flies producemostly gray-bodied offspring, but some of the offspring have blackbodies. If there are 280 offspring, how many will you predict willhave grey bodies and how many will have black bodies? How many ofthe 280 offspring do you predict will be heterozygous? Show yourwork. D

11. In a dihybrid cross AaBb X AaBb what fraction of the offspringwould be D

i) homozygous for both recessive traits
ii) heterozygous for both traits
ii) homozygous for both traits

amaranthwasp103

1. How does meiosis generate genetic diversity?

a) crossing over

b) random alignment at metaphase I

c) synapsis

d) both crossing over and random alignment at metaphase I

2. What would happen if crossing over occurred between sister chromatids?

a) Genetic diversity would decrease due to the loss of gene combinations.

b) Genetic diversity would increase due to the addition of gene combinations.

c) Gene rearrangement would lead to changes in gene expression.

d) Nothing would happen becasue sister chromatids are genetically identical or nearly identical.

3. Animals that sexually reproduce are _____ and produce _____ gametes. (haploid, diploid; haploid, haploid; diploid, diploid; diploid, haploid)

4. The F1 generation of a cross between two individuals, one that is homozygous dominant for a trait and the other that is homozygous recessive for the trait, will yield progeny with the same phenotype. (true or false)

5. Homologous chromosomes separate from each other in:

a) mitosis

b) meiosis I

c) meiosis II

d) They never separate from each other during any form of cell division

chocolatealpaca651

Hi, could somebody explain me how the linked genes A/a and C/c affect the probability in the following problem?

You are running a dihybrid cross involving 4 different genes. Three different chromosomes are involved and only the A/a and C/c genes are linked. With diploid parents AaBbccDd x AaBbcCdd (Ac and aC are linked in the second parent) and no crossing over, what are the odds of progeny with genotypes (a) aaBbccdd, (b) aabbCcDd, (c) AABbccdd?

Here are the solutions but I do not understand how they obtiened the calculations for A/a and C/c

Answers: (a) Canât happen (second parent provides gametes Ac and aC only; (b) Â¼ (bb part) * Â½ (Dd) * Â¼ (aaCc) = 1/32; (c) Â½ * Â½ * Â¼ (same order as with (b)) = 1/16

BIOL 121 Study Guide - Midterm Guide: Mendelian Inheritance, Metaphase, Zygosity

BIOL 121 Full Course Notes

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