Genetics Homework. 2 points each. Name_____________________
1. A certain species has three pairs of chromosomes: an acrocentric pair, a metacentric pair and a submetacentric pair. Draw a cell of this species as it would appear during each of the following phases:
Metaphase of mitosis and Metaphase II of meiosis.
2. A diploid cell has x amount of DNA during G1. How much DNA in (in multiples of fractions of x) is present per cell at the following stages?
|
Event |
Amount of DNA per cell |
|
G2 |
|
|
Anaphase of mitosis |
|
|
Prophase II of meiosis |
|
|
Immediately after cytokinesis associated with meiosis II |
|
3. Indicate where in mitosis or meiosis, or both, the following events take place. Give all possible stages:
|
Event |
Stage(s) |
|
Tetrads form |
|
|
Sister chromatids separate into unreplicated chromosomes |
|
|
Chromosome number is reduced from haploid to diploid |
|
|
Chromosome number doubles compared to the immediately previous stage |
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4. A certain diploid animal has a 15 pairs of chromosomes. How many different arrangements of maternally and paternally derived chromosomes are possible at the metaphase 'plate' during metaphase I?
5. A certain species of seaweed shows alternation of generations, but the diploid phase looks like the haploid phase. A Red mutant of the normally brown species is placed with a brown seaweed selected at random. Soon new 'plants' started appearing, half of which were red and half of which were brown. Suggest a likely explanation for this result.