2. An onion cell (2n) with 10 autosomes and 2 sex chromosomes is about to undergo meiosis. How many cells will result from this process, and what is the chromosome number and ploidy of each cell?
1. A recently discovered bird species was found to have 29 chromosomes in its somatic cells before S phase.
a. How many chromosomes (2n) are present in a somatic cell during mitosis?
b. How many chromosomes does a bird receive from one parent?
c. How many sister chromatids are present during metaphase 2?
d. Assuming this species follows the same XX/XY sex differentiation as mammals, how many sex chromosomes are in an unfertilized egg?
e. How many pairs of homologous chromosomes would you expect to see lined up during metaphase 2?
2. An onion cell (2n) with 10 autosomes and 2 sex chromosomes is about to undergo meiosis. How many cells will result from this process, and what is the chromosome number and ploidy of each cell?
3. An animal is heterozygous for two autosomal genetic traits found on different chromosomes. Purple fur is inherited dominantly (with pp genotype giving green fur) and the gene is located near the telomere on the short arm of an acrocentric autosome. The gene for claw sharpness is located closer to the centromere on one arm of a metacentric chromosome. The S+ allele is dominant and results in sharp pointy claws, while the SS genotype gives the animal rounded dull claws. Create and label a diagram showing all possible arrangements of the chromosomes involved in these traits’ inheritance during metaphase 1.
Trending now
This is a popular solution!
Step by step
Solved in 2 steps
