Humans have one of two types of hairlines on their foreheads. The "V" shaped hairline refers to a trait called Widow's Peak (W) that is dominant over a straight hairline (w). If Chris has the genotype WW and Janet has the genotype ww, what can we say about their four children? All of their children would have a straight hairline.

All of their children would have a widow's peak hairline.

Half of their children would have a straight hairline and half would have a widow's peak hairline.

Three of the children would have a widow's peak hairline and one would have a straight hairline.

all of their children would have a widow's peak hairline

Explanation:

Chris's genotype consists of two dominant widow's peak genes and Janet has two recessive widow's peak genes so the each of the children will inherit one dominant and one recessive widow's peak genes from each parent, making them exhibit "v" shaped hairline and also being carriers for straight hairline.

the diploid number of chromosomes is sometimes represented by the symbol 2n. for the fruit fly, the diploid number is 8, which can be written as 2n = 8, where n represents twice the number of chromosomes in a sperm or egg cell.