The seed coat is formed by the hardening of the
A. ovule.
B. integument.
C. endosperm.
D. embryo.
E. prothallus.
B. integument.
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In insects, the passage from one body form to another is called
A. pupation. B. ecdysis. C. metamorphosis. D. transference.
The female hormones that participate in milk production for the newborn are ____
a. prolactin and oxytocin b. prolactin and estrogen c. prolactin and progesterone d. oxytocin and estrogen e. oxytocin and progesterone
The breakdown of chemical bonds that were formed during the construction of plant and animal tissues is called ________
Fill in the blank(s) with correct word
In Drosophila, the allele red eyes (bw+) is dominant to the allele for brown eyes (bw). At another gene locus on the same chromosome, the allele for thin wing veins (hv+) is dominant to the allele for heavy wing veins (hv). Flies homozygous for bw and hv+ are crossed to flies homozygous for bw+ and hv to obtain doubly heterozygous F1 progeny.Given that these two gene loci are very closely linked, the genotypic ratio in the F2 generation should be closest to
A. 3:1 B. 1:2:1 C. 9:3:3:1 D. 1:1:1:1