Which choice is involved in both sexual and asexual reproduction?

Which of the following does not contribute to the formation of the Mid-

zhuklara [117]

The answer to your question is A.

8 0

3 years ago

suggest two ways in which human activities contribute to an abnormal rise in levels of atmosphere carbon dioxide

WARRIOR [948]

Answer:

Consuming electricity and Transportation

Explanation:

Consuming electricity: Burning fossil fuels emits CO2, with coal releasing twice as much of the gas as petroleum.

Transportation: Whether for business or pleasure, locomotion is the second largest source of U.S. CO2 emissions.

6 0

3 years ago

Blood-sugar levels are regulated by two hormones. Insulin acts to decrease blood-sugar levels; glucagon acts to increase blood-s

BabaBlast [244]

Ingesting a meal will increase your sugar levels, so you need more insulin released to combat that. There will be more insulin released in your body and less glucogon.

6 0

3 years ago

Describe two ways that water moves through the earths biosphere in the water cycle

Iteru [2.4K]

<span>For the first one I would say that the water cycle would be affected because there would be more water in the ground. The roots of the trees soak up the water and keep excellent drainage under the ground. Without trees this mechanism would be all sorts of messed up. Another way it could be affected would be the perspiration from the trees. This might change the humidity of the area.</span>

3 0

3 years ago

In cats, the dominant O allele of the X-Iinked orange gene is required to produce orange fur, the recessive o allele of this gen

Yuliya22 [10]

Explanation:

Female cats have two X chromosomes. In the early stages of mammal development each cell in the embryo will randomly inactivate one of the X chromosomes, and all of its daughter cells will keep that same X chromosome inactive (its genes won't be expressed).

For that reason, the adult individual will have patches of cells that express the genes of only one X chromosome, and patches of cells that express the genes of the other one.

<h3>a) What type of crosses would be expected to produce female tortoiseshell cats? </h3>

The female tortoiseshell cats have patches of cells that express the dominant <em>O</em> allele and patches of cells that express the recessive <em>o</em> allele. That means that they have the genotype XᴼXᵒ.

These females can come from the crosses of:

XᴼXᴼ x XᵒY: Orange female x black male
XᵒXᵒ x XᴼY: black female x orange male
XᴼXᵒ x XᵒY: tortoiseshell female x black male
XᴼXᵒ x XᴼY: tortoiseshell female x orange male

<h3>b. Suggest a hypothesis to explain the origin of male tortoiseshell cats</h3>

Male cats normally have one Y chromosome and <u>one</u> X chromosome, and their fur will have the color determined by the allele of the O/o gene in the X chromosome they have. However, in rare cases males can have two X chromosomes and a Y chromosome. If the genotype is XᴼXᵒY, the males will also inactivate one of the X chromosomes randomly in each cell, giving the tortoiseshell phenotype.

<h3>c. Calico cats (most of which are females) have patches of white, orange, and black fur. Suggest a hypothesis for the origin of calico cats.</h3>

The patches of white are determined by another gene (Piebald Spotting, with the alleles S/s) in an autosomal chromosome, that basically causes unpigmented fur. A homozygous genotype <em>SS </em>produces large patches of white fur, the heterozygous <em>Ss</em> genotype causes smaller patches of white, and the homozygous <em>ss </em>genotype determines the lack of white color.

Female Calico cats would have the genotypes XᴼXᵒ SS or XᴼXᵒ Ss.

8 0

3 years ago