Human+Genetics+1+-+RJ

(1) Define: __alleles__- alterantaive form of a gene __dominant allele__-allele that exerts its phenotypic effect in the heterozygote. __recessive allele__- allele that exerts its phenotypic effect only in the homozygous. __locus__- particular site where a gene is found on a chromosome. __homozygous dominant__- possessing two identical alleles, such as AA, for a particular trait. __phenotype__-visible expression of a genotype such as brown eyes. __homozygous recessive__- possessing two identical alleles, such as aa, for a particular trait. __heterozygous__- possessing unlike alleles for a particular trait.** (2) What is the difference between genotype and phenotype? (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? (4) For each of the following genotypes, give all the possible gametes. __WWSs-__ WW WS Ws Ss __Tt-__ T,t __Ttgg-__ Tg tg gg __AaBb-__ Aa Ab Ba Bb, AB, ab** (5) For each of the following, state whether a genotype or a gamete is represented. __Ll-__ gamete __Pw-__ geno __LlGg-__ geno** (6) What is the genotype of the individual from the following crosses? eS x es** (7) Define monohybrid and Punnett square (8) A man with a wiidow's peak has a mother witha a straight hairline. Widow's peak (W) is dominant over straight hairline (w). What is the genotype of the man? (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? (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?
 * __genotype__- genes of an individual for a particular trait or traits.
 * **genotype is for the individual and its traits and phenotype is the expression.**
 * **EE Ee ee**
 * __WW-__ W
 * __D-__ gamete
 * ES x es
 * **__Mono__- cross with one trait.**
 * **__Punnett square-__ how many possible combinations**
 * **Ww**
 * **1/4**
 * **EeEe**