When the rabbit is three months old, it is easy to tell its sex. At this time, a bulging round bag will grow on the mother rabbit's ass.
In addition, the standard to distinguish male rabbits from female rabbits is to compare their sizes. Generally, a big rabbit is a male rabbit.
Rabbits' eggs are not fertilized and develop into rabbits after stimulation. Some of these parthenogenetic rabbits are heterozygous for some genes. How do you explain it? (hint: polar body fertilization. )
A: One type of animal parthenogenesis is that female diploids produce haploid eggs and polar nuclei through meiosis, and the eggs and polar nuclei fuse to form diploid eggs and then develop into diploid individuals. For example, AaBb can produce aB, ab, Ab and AB eggs and polar nuclei through meiosis. AB eggs and AB polar nuclei come from the same secondary oocyte, and they fuse to form AABB eggs, which are homozygous. If aB eggs and Ab polar nuclei fuse, individuals are heterozygous for site A. If AB eggs and AB polar nuclei fuse, individuals are heterozygous for site B.. If aB eggs and Ab polar nuclei fuse, individuals are heterozygous for both A and B sites.
It may be that the second polar body binds to the egg cell, and some genes may be heterozygous.