Question

Body coler in fruit flies is controlled by a gene with a dominant allele for gray (G) AND A RECESSIVE ALLELE FOR BLACK (g). A gene controlling wing lenght has a dominant allele for long wing (L) and a recesive allele for short wing (l). The genes for a body coler and wing length are linked. If a male fly with the genotype GGLL is crossed with a female of the genotype ggll, what will be the genotypes and phenotupe of the offsprings?

Answer 1

do you understand this

Answer 2

what grade are you in

Answer 3

let me try and see if I can remember

Answer 4

9) In humans, cataracts in the eyes and fragility of bones are caused by dominant alleles that
assort independently. A man with cataracts and normal bones marries a woman without
cataracts but with fragile bones. The mans father had normal eyes, and the woman’s father has normal bones. What is the probability that the first child of this couple will a) be free from both abnormalities, b) have cataracts but normal bones, c) have fragile bones but no cataracts and d) display cataracts and fragile bones? (6 marks)
Man’s genotype is Cc ff
Woman’s genotype is cc Ff (2 marks)
Cross Cc ff x cc Ff
a) phenotype no abnormalities has genotype cc ff
½ x ½ = ¼ (1 mark)
b) phenotype cataracts but normal bones has genotype Cc ff
½ x ½ = ¼ (1 mark)
c) phenotype normal eyes but fragile bones has genotype cc Ff
½ x ½ = ¼ (1 mark)
d) phenotype cataracts and fragile bones has genotype cc ff
½ x ½ = ¼ (1 mark)
Like two combined test crosses 1:1:1:1
can u follow that example and see if it helps?cant remember quiet well.

Answer 5

yes I follow

Answer 6

or maybe this one,




5) In radishes, flower color may be red, purple or white. The edible portion of the radish may be long or oval. When only flower color is studied, no dominance is evident, and red x white yields all purple. If these F1 purples are interbred, the F2 generation consists of ¼ red: ½
purple: ¼ white. Regarding the radish shape long is dominant to oval in a normal Mendelian fashion. Determine the F1 and F2 phenotypes from a cross between a true breeding red, long radish and one that is white oval. (11 marks)

Modified dihybrid cross:
Consider the outcome of Crossing F1 parents for color genes (Rr x Rr). Then consider the outcome of shapes (Oo x Oo) with forked-line method

RR = red Rr = purple rr = white incomplete dominance (1 mark)
OO = long oo = oval (1 mark)

P1: RROO (red, long) x rroo (white, oval) (1 mark)

F1: all RrOo (purple, long) (2 marks)
F1 x F1: RrOo x RrOo

¾ OO 3/16 RR OO, red long
1/4 RR ¼ oo 1/16 RR oo , red oval (2 marks)

F2: 2/4 Rr ¾ OO 6/16 RrOO , purple long
¼ 00 2/16 Rr oo , purple oval (2 marks)

1/4 rr ¾ OO 3/16 rr OO , white long
¼ oo 1/16 rr oo , white oval (2 marks)

Answer 7

yes, but what about if you can help me with the one I have or can you tell me who can

Answer 8

emm, lets say a will have to look at it first., I will give u the feedback tomorrow coz now a have a test tomorrow so I have to prepare for it.is that fine with you?