Answer:
Fourth
Explanation:
The pregnant woman usually feels the baby moving the belly for the first time between the 16th and 20th weeks of gestation, that is, at the end of the 4th month or during the 5th month of pregnancy. However, in the second pregnancy, it is normal for the mother to feel the baby move earlier, between the end of the 3rd month and the beginning of the 4th month of pregnancy.
Answer:
D. Sterility Locus
Explanation:
Angiosperms have several mechanisms to prevent self-pollination due to the advantage of cross-pollination. One of such mechanisms is self-incompatibility genes present on the sterility locus.
These genes determine the germination of the pollen on the stigma. If both the pollen and stigma carry the same allele of the gene present at the sterility locus, the germination of pollen is prevented.
The sterility locus has multiple alleles and the presence of the same alleles at the same locus in both pollen and stigma prevents the pollen germination.
For example, pollen from S1S2 individuals can not germinate on the stigma with the S1S3 genotype. Here, the pollen does not obtain water as required for germination from the stigma and are unable to germinate.
