Outbreak of diseases may cause by pathogens such as such as bacteria, viruses, fungi, and parasites. On the cell surface of these organisms proteins are present called antigens. On entering the antigen in the body, the immune system produce antibodies against antigen. It is better to test for disease antigens in sudden outbreaks because these antigens confirms the origin of the outbreak before the pathogen get destroyed by antibodies.
Answer:
Explanation:
The genetic determination of coat colors in calico cats is linked to the X chromosome wherein calicos are nearly always female, with one coat color allele linked to the maternal X chromosome and a second coat color allele linked to the paternal X chromosome.
Since, the females possess two X chromosomes (XX), they can be either homozygous for each coat colour or be heterozygote (calico). But in the males, since this trait is X- linked and males have just the one X chromosome (XY), they can only possess either of the coat colour and not be an heterozygote. But an XXY male cat can be a calico due to the presence of the two X chromosomes.
A sperm cell and an egg cell fuse to form which structure is called a <span>zygote. The zygote is a product of fertilization of two gametes: egg cells for female and sperm cells for males. In this process,the DNA of both cells is passed to the offspring to form a new individual. </span>
