Eukaryotes, multicellular
Answer:
9:3:3:1
Explanation:
If two parents for a dihybrid cross are fully heterozygous for two genes, the phenotype ratio comes 9:3:3:1. Here, the alleles of both genes should exhibit complete dominance-recessiveness. This means that one allele of a gene should be able to mask the expression of its another allele. Similarly, alleles of one gene genes should assort in a random manner during anaphase-I irrespective of the assortment of alleles of another gene.
Under these conditions, each parent produces four types of gametes in equal proportion. And the random fusion of these gametes gives progeny in 9:3:3:1 phenotype ratio.
For example, a dihybrid cross between TtRr and TtRr would produce progeny in the following phenotype ratio=
9 tall and red: 3 tall and white: 3 dwarf and red: 1 dwarf and white
Here the allele T gives "tallness" while the allele "t" gives "dwarfism". The dominant allele "R" gives "red flowers" while the recessive allele "r" gives white flowers.
Answer: Mosses gametes are produced by mitosis and ferns gamete are also produced by mitosis.
Explanation:
Mosses and ferns are bryophtes, a group of plants that live in moist habitats and lack true leaves and root.
Mitosis is a form of cell division where a single cell divides to produce two identical daughter cells.
During the life cycle of ferns, the diploid sporophyte produce haploid spores by meiosis. The prothallus of the sporophte produce gametes by mitosis.
In mosses, the diploid sporophyte produce spores from a capsule which open when a small structure operculum degenerates. A single spore germinate to form protenama from which the gametes are produced through mitosis.
Malleable because the rest are chemical
Answer:
Share valence electrons
Explanation:
Covalent bonds are also known as molecular bonds. This is the type of bond that occurs between non-metals and non-metals. This type of bond can happen between two of the same elements or with other elements that are usually positioned near each other in the periodic table.
This is different from ionic bonds where atoms are lost or gained. This type of bonds occur between metals and non-metals.
