Question

12 multiple choice 2 points the arrangement and ordering of homologous pairs of chromosomes in metaphase i during meiosis is random nonrandom by size of the chromosome preplanned 13 multiple choice 2 points mice have two forms of the gene for hair texture. straight hair (h) is dominant to curly hair(h). they also have two forms of the gene that determines the length of their tails. short tails(t) are dominant to long tails(t). what would be the phenotypic ratio of the offspring if a mouse that was heterozygous for straight hair and had a long tail was crossed with a mouse that had curly hair and was homozygous for short tail length. construct a punnett square to determine the ratio. 3:1 1:0 1:1 2:1 14 multiple choice 2 points the study of heredity is mendology genetics histology cytology

Explanation:

1. In meiosis, the arrangement and ordering of homologous pairs of chromosomes in metaphase I is random, which is a key aspect of genetic variation - this is due to independent assortment.
2. For the mouse cross: The first mouse has genotype Hhtt (heterozygous for straight hair and long - tailed) and the second has genotype hhTT (curly - haired and homozygous short - tailed). The possible gametes from the first mouse are Ht and ht, and from the second are hT. The offspring genotypes are HhTt (straight hair, short tail) and hhTt (curly hair, short tail) in a 1:1 ratio.
3. The study of heredity is genetics. Mendology is not a recognized term for the study of heredity, histology is the study of tissues, and cytology is the study of cells.

Answer:

1. A. random
2. C. 1:1
3. B. genetics