A true-breeding specimen seems to be homozygous, thus, the blue color flowers must exhibit the genotype BB and the yellow ones must have possessed the genotype YY.
In the given case, when one crosses a flower with genotype BB and other with genotype YY, all the offspring will be BY. As in the next generation, all the flowers appear blue, thus, the blue allele must be dominant.
Answer:
I'm not sure about 13 and 19.
13. Traits?
14. Hagfish
15. No, it doesn't have jaws.
16. Mammary glands.
17. Jaws and lungs.
18. Lizard, bird, cow, lion.
19. The bird?
20. Claws/nails, lungs, and jaws.
Also, this is a cladogram, in case you needed the info. :)
I don't understand the question.... Can you rephrase it?
Answer:
Disadvantages of having an exoskeleton include heightened vulnerability during the molting process and restrictive in terms of sizes and weights.
Explanation: