Please help me!! 17. Suppose that in sunflowers, the texture of the leaves is kn

Question

Please help me!! 17. Suppose that in sunflowers, the texture of the leaves is known to be a quansitative trat infuenced by several genes. The texture varies from smooth to crenulated. A cross is made between a crenuiicd and a smooth parent (the two extreme categories), and Eleven phenotypic categories are identifiable among 1000 offspriag those offspring are mated to produce an F from the F, generation How many genes are likely to be directly involved in determining the texture of sunfower leaves? a) one b) three c) five d) eleven c) you can't tell from the information given 18. Budgerigars can be blue, yellow or green. Color is due to a single gene with two codominant allles (blbue and yellow), green birds are heterozygous. You genotype find that 360 of the birds are green. What is the frequency of the yellow alleke? a) V360/600 b)% (240600) a population of 600 budgies and c) /(240/600) d) N4 (240600) e) there's not enough information to tell 19. Ifone Holiday junction region is resohved by an NS cut and the other by an EW cut, the resuling chromosomes a) are nonrecombinant and carry the combinations Al and B2 or A2 and BI b) are nonrecombinant and carry the combinations Al and BI or A2 and B2 c) are recombinant and carmy the combinations A I and B2 or A2 and BI d) are recombinant and carry the combinations Al and B/ or A2 and B2 e) are AI and A2 or BI and B2 20. In contrast to Drosophila, some arthropods (eg, centipedes) have legs on almost every segnent posterior to the head. Based on your knowlkdge of Drosophila, how will the pattem of gene expression be diflerent in centipedes compared to Drosophila? a) the concentration of Bicoid willbe higher throughout the embryo in centipedes b) pair rulk genes will show an anterior-posterior gradient of expression in centipedes c) segnent poarity genes will be repressed d) genes in the Antennapedia complex will be expressed more posteriorly e) genes in the bithorax complex will be expressed more anteriorly 21. A plant trisomic for a chromosome carrying the G gene has the genotype Gigg What gametes would this plant produce, and in what proportions? a) 2 g I G b) 2 gg I G c)1glG

Explanation / Answer

1. One. Because presence or absence of that particular gene is responsible for expressing or not expressing the trait.

2. Frequency = u/s = 240/600

3. C

4. D. Antennapedia is involved

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