Normal somatic cells of horses have 64 chromosomes 2n 64 Ho

Normal somatic cells of horses have 64 chromosomes (2n = 64). How many chromosomes and DNA molecules will be present in horse cells, assuming the cell is in G_1 stage? 32 chromosomes and 32 DNA molecules 32 chromosomes and 64 DNA molecules 64 chromosomes and 64 DNA molecules 64 chromosomes and 128 DNA molecules 128 chromosomes and 128 DNA molecules On average, what proportion of the genome in two half siblings would be exactly the same if no crossing over occurred? (For the purposes of this question only, we will ignore the special case of the X and Y sex chromosomes and assume that all genes are located on non-sex chromosomes.) One-fourth of their genomes One-third of their genomes One-half of their genomes Three-fourths of their genomes It cannot be determined from the information given. On average, what proportion of the genome in a grandfather and grandchild would be exactly the same if no crossing over occurred? (For the purposes of this question only, we will ignore the special case of the X and Y sex chromosomes and assume that all genes are located on non-sex chromosomes.) One-fourth of their genomes One-third of their genomes One-half of their genomes Three-fourths of their genomes It cannot be determined from the information given.

Solution

2nd question

half siblings share only one fourth of their genomes because they have only one parent in common

3rd question

grandparent and grandchild would share 1/4 of their genomes because the grandchild would share one half of her genome with her parent and the parent would share one half of her genome with the childs grandparent