Final answer:
Expected black offspring from a cross between black and black lace angelfish ranges from 75% to 100%, assuming black is dominant and angelfish follow Mendelian inheritance patterns.
Step-by-step explanation:
To predict the expected percentage of black offspring from a cross between a black angelfish and a black lace angelfish, we must understand the genetic principles involved, typically Mendelian inheritance. Without specific genetic information about the angelfish, we can consider that the black coloration (B) could be dominant over the black lace (b), assuming a simple Mendelian trait for color.
If the black angelfish is homozygous for black color (BB), and the black lace angelfish is heterozygous (Bb), then the expected offspring would all be black, since the lace allele is only expressed when two copies are present. However, if both parents are heterozygous (Bb), the anticipated genotypic ratio would be:
- 25% homozygous black (BB)
- 50% heterozygous (Bb)
- 25% black lace (bb)
The phenotypic ratio would be:
- 75% black (BB and Bb)
- 25% black lace (bb)
In summary, depending on the genetic makeup of the parents, the expected percentage of black offspring could be between 75% to 100%.