Crossing over happens in Meiosis 1 only. In Prophase 1 a cells chromatin (chromatin = chromosomes that have not condensed yet) condense and pair up forming homologous chromosomes (paired = XX (2 chromosomes together)). When this happens segments/ alleles of the chromosomes pairing up swap over. This creates genetic diversity as each chromosome is different, it has parts from its pair. This leaves every chromosome unique and individual.

I hope this helps, sorry some of the vocab is rather technical. By the way I would suggest watching the 'Crash Course: Meiosis' on YouTube, this really helped me when I was learning this topic. :D

5 0

3 years ago

Read 2 more answers

While walking to the kitchen in the middle of the night, jamal tripped over an object that he could not see in the dark. which p

lukranit [14]

The part of the cns sent a signal to help prevent Jamal's fall was the cerebellum

<h3>How does the cerebellum act in balance?</h3>

Balance and posture are the responsibility of the cerebellum, which coordinates body movements, uniting and articulating muscle movements so that they keep the body balanced and maintain its posture.

With this information, we can conclude that the part of the cns sent a signal to help prevent Jamal's fall was the cerebellum

Learn more about cerebellum in brainly.com/question/13504830

#SPJ4

7 0

2 years ago

Read 2 more answers

Assume that the body has been sectioned along three planes: (1) a median plane, (2) a frontal plane, and (3) a transverse plane

Anit [1.1K]

Answer:

lungs and kidneys

Explanation:

The median plane divides the body into two halves through a mid line.

The transverse plain is also known as the axial plane and it divided the body into the upper part and a lower part.

The frontal plane is also known as the coronal plane. It divided the body into the dorsal and ventral sections. The dorsal and ventral sections are the front and back sections ( belly and back).

Lungs and kidneys are the only parts which cannot be seen through all the three plains.

6 0

4 years ago

A scientist is studying some developing eggs from an ocean sample. The early embryos have divided only a few times, and all cell

Kay [80]

Answer:

The correct answer is - deuterostomes.

Explanation:

Duetorstomes eggs ,During embryonic development the zygote undergoes cleavage. Cleavage results is slitting into multiple cells where ease cell has the ability to develop into a complete embryo when isolated.

6 0

3 years ago