1) Which of the following statements most accurately describes domestication syn
ID: 302050 • Letter: 1
Question
1) Which of the following statements most accurately describes domestication syndrome?
a) Genes responsible for temperament are on the same chromosome as genes responsible for certain facial features.
b) A single gene codes for both temperament and certain facial features, such as jaw size.
c) Genes responsible for mild temperament are only expressed when genes encoding a cute face are also present.
d) The products of genes encoding temperament interact with the products of genes encoding facial features.
2) Genetic diversity is the total number of genetic characteristics in a species. Explain how chromosomal crossover contributes to genetic diversity.
a) Chromosomal crossover is a specific, non-random process during which chromosomes are linked together and exchange DNA, contributing to the genetic diversity.
b) Chromosomal crossover occurs during meiosis when chromosome pairs are linked and exchange DNA. Thus, crossover increases the variance of genetic combinations in the haploid gamete cell.
c) Chromosomal crossover results in the inheritance of genetic material by offspring and the recombination event is not variable in frequency or location.
d) Chromosomal crossover occurs during the mitotic process when chromosomes are linked together and recombination takes place, increasing the variance of genetic combinations in the haploid mitotic cells formed from mitosis.
3) The figure represents a Drosophila linkage map for genes A-E. The numbers between the gene loci are the relative map units between each gene. Based on the linkage map, which two genes are most likely to segregate together?
a) A and B
b) B and C
c) C and D
d) D and E
C D E 8 12 3 5Explanation / Answer
1. Domestication syndrome is a group of traits observed to occur together in domesticated animals and plants. In animals domestication, results in tameness, docility,coat color changes,smaller jaws, floppy ears and tooth size reduction. The products of genes encoding temperament interact with the products of genes encoding facial features.
2. Crossing over or recombination is the exchange of chromosome segments between non sister chromatids in meiosis. Crossing over creates new combinations of gene in the gametes that are not found in either parent contributing to genetic diversity. Chromosomal crossover occurs during meiosis when chromosome pairs are linked and exchange DNA. Thus, crossover increases the variance of genetic combinations in the haploid gamete cell.
3. The distance between the genes determine how closely they segregate. The more the distance between the genes, the more likely they will segregate separately. The distance between C and D is closely and they are likely to segregate together.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.