The type of joint that allows bones to move backward and forward in only one direction is the hinge joints. Ball and socket are the joints that allows movement in all directions. Gilding joints are type of joints that are the vertebral disks that allow twisting, turning, and sliding. Hinge joints are formed between two or more bones where the bones can only move along one axis to flex or extend. They include the ankle, elbow and knee joints.
Answer:
dominant
Explanation:
In this example, if heterozygous individuals that carry one wild type allele and one mutant allele (mutant/wild-type) are phenotypically wild-type, then, the wild-type allele is dominant. This is explained by the fact that wild-type is expressed, even when mutant allele produces a non-functional gene.
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Answer:
La verdad es que, literalmente, no existe un "fósil viviente". Todas las especies evolucionan, incluso si no es obvio.
Explanation:
Answer:
Male cones produce microspores.
Pollen grain contains cells that develop into sperm.
Explanation:
Gymnosperms are seed-bearing vascular plants. They produce cones and seeds to carry their reproductive structure. They produce both types of cones (male and female) for fertilization by making gametes. Male cones produce microspores to make pollen grains. Female cones give rise megaspores which produce ovules. Pollen grains spilt up to make sperm. One of these sperms fuse with egg cells for the fertilization.
