<span>Cocci also known as a spherical shape
Bacilli also known as a rod-shape
Spirochaete also knows as a spiral-shape</span>
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
The amniotic fluid helps keep the temperature of the prenatal world constant.
Amniotic fluid surrounds the developing fetus inside the womb and protects the fetus from injury and temperature changes. It additionally lets in for freedom of fetal movement and permits musculoskeletal improvement.
Amniotic fluid is chargeable for: defending the fetus: The fluid cushions the infant from outdoor pressures, acting as a shock absorber. Temperature manipulation: The fluid insulates the child, maintaining it warm and preserving a normal temperature. contamination control: The amniotic fluid carries antibodies.
In the beginning, amniotic fluid is especially water with electrolytes, however, using approximately the 12-14th week the liquid also incorporates proteins, carbohydrates, lipids and phospholipids, and urea, all of which aid in the growth of the fetus.
Learn more about the amniotic fluid here brainly.com/question/14924089
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