Exam 25: Sexual Reproduction,meiosis,and Genetic Recombination

In meiosis in females,only one haploid cell develops into an egg.The remaining haploid products of meiosis are ________,which usually degenerate.

In humans,the volume of an egg is 100 times the volume of a sperm.Compared to the amount of chromosomal DNA in an egg,the amount of chromosomal DNA in a sperm is

One parent carries a dominant allele (A^L)that is lethal in early life in homozygotes.The other parent is homozygous for the wild type allele (A⁺)of the same gene.What is the expected dominant:wild type phenotype ratio for their offspring?

You are interested in mapping the relative positions of three genes in the E.coli genome and have access to several cell types to use for the mapping: a)Describe F^?,F⁺,Hfr,and F' bacterial cell types. b)How would you use one or more of these cell types to map genes A,B,and C in the E.coli genome? c)If you found that the results were A = 10,B = 5,and C = 3 (in the correct units),what could you conclude about the order and proximity of the three genes?