Can anyone work out number 13? I know the answer but I don\'t know how to do it.

Question

Can anyone work out number 13? I know the answer but I don't know how to do it. will give points to the person who actually show how to do it :)

13. Britle endospem (b)i glossy leaf andosperm and glossy leat are both on chromosome 8 and mp 8 o map units apat Red aeoe is for britse and red is different chromosome and is unlined to b or g A strain of com rat is homotygous arossed to a strain that is homarygous for glossy leat The F1 were entirely wid-aype An F1 indviduai was the offspring are expected to be brite, glossy and red a 21.5 b. 200 c 230 d21.0 43.0 14. How many of the offispring will be ritle and red but not glossy? a 350 b. 230 d. 200 75 15 Vestigial wings and ebony body are autosomal recessive lodi on different chromosome pairs (nat linked A laboratory strain that is both vestigial and ebony is crossed to a wild-type fly caught near Bikini Island The s n the South Pacific used for testing the H-bomb) The F1 maies from this cross are test crossed to a homozygous vestigial ebony female. Among 1000 progeny. 516 were phenotypicelly wild-type and 484 were vestigial and ebony No other phenotypes were observed. What sort of chromosomal reartrangement could cause these unusual resuts. (Remember that male Drosophila do not cross over) a a pericentric inversionb a reciprocal translocation a paracentric inversion

Explanation / Answer

Q no 13

Homozygous Brittle –bb

Homozygous Red – prpr

Homozygous Glossy-gg

gg X prpr bb =      ggbb ggprpr (wild type)

                                 gametes – gb    gpr

                   gg              bb           prpr

gb              gbgg        gbbb      gbprpr

gpr            gprgg       gprbb     gprprpr

Homozygous Brittle – 2 out of 6

Homozygous Red – 2 out of 6

Homozygous Glossy-2 out of 6

Out of 1000 offspring - 20 is expected to be brittle

Out of 1000 offspring - 20 is expected to be red

Out of 1000 offspring - 20 is expected to be glossy

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