Sex determination and SRY: down to a wink and a nudge? It is even more significant that calreticulin is expressed in sperm in C. Upon reaching stage 15, eggs received one of 4 treatments.
J Morphol. The converse was not true. Differences in expression of alternative alleles can have important phenotypic consequences Knight et al. Our results showed that the primary and secondary brood sex ratios produced after the CORT treatment were 0.
Our finding that the relationship between maternal condition and brood sex ratio adjustment differed between years is consistent with previous studies in the blue tit. Embryos from both groups were sampled on days 1, 2, 3, 4, and 5 of the temperature shift.
Crews and colleagues  pioneered this procedure to administer estrogens to the developing embryo. Development in vitro of mouse oocytes from primordial follicles. Sem Cell Dev Biol. Using agronomic traits and semiochemical production in winter wheat cultivars to identify suitable trap crops for the wheat stem sawfly.
J Morphol. They explained the difference as follows: 1 early in the flight period there are more mated females than later in the season when males have died, 2 these mated females lay female eggs fertilized with sperm, but some are killed by the solid pith as eggs or larvae, 3 scarcity of males later in the flight period results in unfertilized eggs that yield more males which go on to survive because some of the earlier cohort dies in solid pith cultivars.