What phenotypic ratio would you expect as a result of a test cross between a dihybrid organism and one that is homozygous recessive for alleles at two independent loci?
a. 3:1
b. 9:3:3:1
c. 1:1:1:1
d. 1:2:1
e. 9:4:2:1
Answer:
c. 1:1:1:1
Explanation:
When a heterozygous individual for two genes is test crossed with a double homozygous recessive individual, the progeny is obtained in 1:1:1:1 phenotypic ratio. This occurs as the heterozygous dominant individual forms four types of gametes in 1:1:1:1 ratio while the homozygous recessive individual would form only one type of gamete having one recessive allele for each gene.
For example, a test cross between TtRr (tall and red) and ttrr (short and white) would produce a progeny in following ratio=
1 tall, red: 1 tall, white: 1 short, red: 1 short, white
Here, T= tall, t= short, R= red, r= white
A. a gorilla that uses sign language to express itself
Answer:
Freshwater wetland biome
Explanation:
Wetlands are defined as those areas where the land area is mostly covered by water seasonally or annually. The areas remain wet. Freshwater wetlands are a type of biome that is not connected to the ocean. They are found mainly along the boundaries of rivers, streams, and lakes. The water in the freshwater wetland is generally evaporated during the summer season.
This biome is highly rich in nutrients that provide a favorable site for the existence of numerous plants and animal species. The leaves that are detached from the trees are deposited within the soils and also captures and accumulates the organic materials that are eliminated from the large trees within this region.
A gene is a hereditary trait in your body and also apart of your DNA not visible to the naked eye making up how you look
