Genetic+HW+2+PK


 * Patricia Kelley's Homework**



(1) Define:


 * genotype:** the individual's genes
 * alleles:** alternative forms of a gene having the same position on a pair of chromosome and affecting the same trait
 * dominant allele:** the uppercase letter
 * recessive allele:** lowercase letter
 * locus:** the same location on a pair of homologous chromosomes, plural loci
 * homozygous dominant**: if a sperm and egg has the alleles EE
 * phenotype**: the physical appearance of the individual
 * homozygous** recessive: if a sperm and egg have the alleles ee
 * heterozygous**: if a sperm and egg have the alleles Ee

//(2) What is the difference between genotype and phenotype?// - A phenotype is the characteristic which results from the genotype

//(3) What are the three possible genotypes and two possible phenotypes for a characteristic that is controlled by two alleles, one being dominant and the other recessive?// - AA, Aa, and aa - dominant phenotypes to EE or Ee - recessive phenotype due to ee



//(4) For each of the following genotypes, give all the possible gametes.// WW: W, W WWSs: WS, Es Tt: T, t Ttgg: Tg, tg AaBb: AB, Ab, aB, ab

(//5) For each of the following, state whether a genotype or a gamete is represented.// D: gamete Ll: genotype Pw: gamete LlGg: genotype

//(6) What is the genotype of the individual from the following crosses?// ES x es: Ee Ss eS x es: eS es



//(7) Define monohybrid and Punnett square// - monohybrid: a cross for one trait (Tt x TT or TT x tt) - Punnett square: a chart that lists all the possible types of sperm are lined up vertically and all possible types of eggs are lined up horixontally (or the other way around) and every possible combination occurs within the squares

//(8) A man with a wiidow's peak has a mother with a straight hairline. Widow's peak (W) is dominant over straight hairline (w). What is the genotype of the man?// - The genotype is Ww.

//(9) Both a man and a woman are heterozygous for freckles. Freckles (F) are dominant over no freckles (f). What is the chance that their child will have freckles?// - The genotype is FF. 75%

//(10) Both you and your sister or brother have attached earlobes, yet your parents have unattached earlobes. Unattached earlobes (E) are dominant over attached earlobes (e) What are the genotypes of your parents?// - Ee and Ee