Human+Genetics+HW+KR

=Human Genetics=

Keaton Rye

 * 1) Define:**
 * genotype**- the genes of an individual


 * alleles**- alternative forms of a gene having the same position on a pair of chromosome.


 * dominant allele**- assigned an uppercase letter, and takes dominance over the recessive allele.


 * recessive allele**- assigned a lower case letter, and is recessive to the dominant allele


 * locus**- a pair of homologous chromosomes


 * homozygous dominan**t- both alleles are dominant traits


 * phenotype**- physical appearance of an individual


 * homozygous recessive-** two recessive alleles


 * heterozygous**- a recessive and a dominant allele

Genotype is the genes of a person. Phenotype is how those genes show themselves physically.
 * (2) What is the difference between genotype and phenotype?**

WW, Ww, and ww. WW or Ww gives a person a widow's peak and ww gives a person a straight hairline because it is repressive
 * (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** W
 * WWSs**- WW,WS,Ws,Ss
 * Tt**- T,t
 * Ttgg**- Tg, tg
 * AaBb**- AB, Ab, Ba, ba

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

ES x es- EsSe eS x es- esSe
 * (6) What is the genotype of the individual from the following crosses?**
 * (7) Define**
 * monohybrid**- heterozygous in one pair


 * Punnett square**- every possible combination of gametes in a chart

His genotype is Ww or WW. The man with it, would have a mother with straight hair.
 * (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?**

1/4
 * (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?**

Ee Ee
 * (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?**