Question

Here's our male dragon: A Autosome Pair #1 Autosome Pair #2 Autosome Pair #3 Autosome Pair #4 Sex Chromosomes And here's his mate: ALA op 10 390 Sex Autosome Pair #1 A Pair A2 Autosome Pair #2 Autosome Pair #3 Pair 43 Autosome Pair #4 Pair 92 Chromosomes Chromosomes Briefly, but as clearly as possible, explain why all the male children of these two dragons will be green, but all their female children will be red!

What information is needed to answer?

what information is needed

Answer 1

Male chromosomes are XY and female's are always XX

Male dragon's sex chromosome has the genotype: XMY; M for red color being dominant to m which is green color. Since the male is heterozygous, he will express the dominant allele and thus will have the phenotype of being a red colored dragon

The female dragon's genotype is: XmXm; she is homozygous recessive and with no dominant allele, will always express the recessive allele and thus will be red colored

When they mate:

Genotypes	Xm	Xm
XM	XMXm	XMXm
Y	XmY	XmY

Thus, all the girls (XX) will have the genotype XMXm (2nd row) and will be red in color (expressing the dominant allele M), while the boys (XY) will have the genotype XmY (3rd row) and will be green (expressing the only allele for color which is on the X chromosome and is recessive).