Correct pronunciation of terms will not

The ______ becomes the placenta. a. yolk sac b. chorion c. amnion d. allantois

LekaFEV [45]

I think the correct answer would be A. The yolk sac becomes the placenta. It is membranous sac that is attached to the embryo. It provides all the nutrition and the blood cells needed by the embryo. It is also called the umbilical vesicle.

3 0

3 years ago

Explain Mendel's law of independent assortment and how the 9:3:3:1 phenotypic ratio among the F2 of a dihybrid cross provides ev

GrogVix [38]

Answer:

Explanation:

Mendel's law of independent assortment state that two different genes assort independently in gamete formation.

To reach this conclusion, one has to do a dihybrid cross. This means that two genes responsible for different traits need to be analyzed at the same time.

1) Starting with a parental generation of a cross between two pure lines (homozygous for both genes) with different traits, a plant with yellow and round seeds (YYRR) and another with green and wrinkled seeds (yyrr). The F1 will be phenotypically homogeneous (yellow and round), and genotypically heterozygous (YyRr).

2) If the individuals from the F1 are crossed with one another, we have to do a Punnett Square to determine the phenotypic ratio of the F2.

If the genes assort independently, the F1 individuals will produce their different gametes with the same probability. Each possible gamete will appear in a 1/4 proportion: YR, Yr, yR, yr.
The 9:3:3:1 ratio is a result of analyzing the possible phenotypes that result from the dihybrid cross.

See the attached image for an illustration of the crosses in each generation and the Punnett Square.

4 0

3 years ago

What are ways that a young plant differs from a parent plant

katrin2010 [14]

Answer:

their size

Explanation:

The most distinct difference between a baby plant and an adult plant is their size. They look very similar but baby plants are much smaller, like a miniature version.

7 0

2 years ago

Some organisms rely on each other for necessities such as food or shelter? True or false

Scrat [10]

Answer:

true

Explanation:

5 0

3 years ago

Read 2 more answers

Which of the following scientists influenced Darwin as he developed his ideas about evolution? Choose all that apply.

algol [13]

Answer:

A and B

Explanation:

His most important observations were made on the Galápagos Islands. Darwin was influenced by other early thinkers, including Lamarck, Lyell, and Malthus. He was also influenced by his knowledge of artificial selection. Wallace's paper on evolution confirmed Darwin's ideas.

6 0

3 years ago