Centromere A BJI HGF ED CKLM Inverted reglon

What is the cross between the progeny of F1 and the homozygous reccessive parent called? How is it usefull?

why two crossovers are needed on one chromatid arm? explain please

In fruit flies, chromosomal crossing over does not occur in meiosis in males, whereas crossing over does occur in meiosis in females. In fruit flies that are heterozygous at many genes (i.e. many maternal and paternal versions of the genes differ), at what stage would cells no longer be heterozygous for any gene during the process of meiosis? a)After the second meiotic division in males, and after the first meiotic division in females. b)After the second meiotic division in both males and females. c)After the first meiotic division in both males and females. d)After the first meiotic division in males, and after the second meiotic division in females.

Diagram the types of gametes you would expect from a ++/yw female, given no crossovers, one crossover, two crossovers, three crossovers, and fours crossovers between bonsister chromatids of homologous chromosomes?

what event takes place during meiosis prophase (as opposed to mitosis prophase) that makes it possible for crossing-over to occur?

Identify each of the following statements as true or false. The chromosomes in B are the result of mitosis from the chromosomes in A.  Alleles B and C are more likely to segregate together during anaphase I than alleles B and A.  The two white chromosomes in B are homologous chromosomes.  Genes A, B, and C are linked genes.  A trihybrid Punnett square can be used to determine the possible combinations of the F1 generation.

In Figure 17-28, what would be the consequence of acrossover between the centromere and locus A?

What is a crossing over, and what is the purpose of it?