In some cattle, the genes for red hair and for white hair are codominant. Cattle with alleles for both red and white hair have both red and white hairs. This condition is referred to as roan.

What is the probability, expressed as a ratio, of a white cow and a red bull having an offspring with the heterozygous genotype?
A. 1 homozygous white : 1 homozygous red : 1 heterozygous

B. 3 homozygous white : 1 homozygous red : 0 heterozygous

C. 0 homozygous white : 0 homozygous red : 1 heterozygous

D. 1 homozygous white : 1 homozygous red : 0 heterozygous
Plz help :

where is the option.let me know

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.

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.