Human+Genetics+WB

(1) Define: genotype, alleles, dominant allele, recessive allele, locus, homozygous dominant, phenotype, homozygous recessive, heterozygous (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. WW WWSs Tt Ttgg AaBb (5) For each of the following, state whether a genotype or a gamete is represented. D Ll Pw LlGg (6) What is the genotype of the individual from the following crosses? ES x es 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?

1. Genotype: Alleles for a specific gene written in the form of EE, Ee, ee. Alleles: Forms of a specific gene that found at the locus of a gene. Dominant allele: Will mask a recessive gene. Recessive allele: An allele that only shows up if the gene has two of the same type. And example is ee. Locus: The location where the gene is found in the chromosome. Homozygous dominant: Two dominant alleles exist. Phenotype: Physical human characteristics. Homozygous recessive: Two recessive alleles exist. Heterozygous: One dominant allele and one recessive allele exist.

2. The difference between genotype and phenotype is that a phenotype comes from a genotype. Phenotypes are physical human characteristics. 3. Dominant phenotypes are evident in Ee or EE. Recessive phenotypes are evident in ee only. 4. WWS- Ws, WS WW- W Ttgg- tg, Tg AaBb- aB, Ab, AB, ab Tt- t, T 5. D- Gamete Ll- Genotype Pw- Gamete LlGg- Genotype 6. ES x es- EeSs eS x es- eeSs 7. A monohybrid is is a cross of one trait. A Punnett square is a table that shows possible combinations for the children of a mother and father. 8. The genotype of the man is Ww. 9. The chance that their child will have freckles is 75%. 10. The mother is EeEe and the father is EeEe.