Based on the ABC Hypothesis, correctly match each of the following genes, with the flower part they are switched on in. Switched on in the sepal and petal whorls Switched on in the petal and stamen whorls Switched on in the stamen and carpel whorls A. Gene C B. Gene A C. Gene B

Switched on in the sepal and petal whorls - Gene A

Switched on in the petal and stamen whorls- Gene B

Switched on in the stamen and carpel whorls - Gene C

Explanation:

The mechanism of flower morphogenesis in Arabidopsis has been deduced through a genetic model called ABC model. The floral homeotic gene  have been classified into 3 categories-A,B and C.

Genes from category A  -APETALA 1 and  APETALA2are expressed in petal and stamen primordia.

Genes from category B -  APETALA 3 and PISTILLATA  are expressed in petal and stamen primordia.

Genes of category C-  AGAMOUS affect stamen and carpels.

the two answers are a, the population of birds with large beaks will increase on the island, and c, the trait for large beaks will be passed on to future generations through natural selection. the reason for that is because if the birds that have beaks developed for eating small seeds lose all of their food, they will go hungry and eventually starve because they physically cannot eat the large seeds, therefore making the population of large beaked birds higher. also, if the trait of large beaks are dominant on the island over small beaks, then over time the large beaked birds will reproduce more and more, while the smaller beaked birds will reproduce less and less because they can't survive with the food provided. that leads to the trait of small beaks disappearing and the trait of large beaks taking over the island.