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nlexa [21]
3 years ago
10

A mass extinction, in which the dinosaurs disappeared from Earth, occurred approximately ____ years ago.​

Biology
1 answer:
Harrizon [31]3 years ago
5 0

66 million years ago

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The diploid garden pea plant has 14 chromosomes. The haploid fungus Neurospora crassa has 7 chromosomes. Neither organism has se
LenKa [72]

Answer:

(B) Garden pea has 7 linkage groups, and Neurospora has 7.

Explanation:

<u>Number of linkage group is always equal to type of chromosomes.</u> In garden pea which is a diploid organism, there are 7 linkage groups because the homologous chromosomes of a pair are alike so even though the total number of chromosomes are 14 yet no. of linkage group will be 7.

Here, it may also be noted that <u>there is no separate male or female chromosomes i.e. no allosomic pair</u> in this organism which are usually different for males and lead to the increase in linkage groups. For example in human males out of the 23 pairs, we have 23rd pair which leads to the increase in linkage groups as compared to number of diploid sets of chromosomes. In human males, 22 pairs of chromosomes are alike but the 23rd pair is different which has 1 X chromosome and 1 Y chromosome which leads to a total of 22+1+1 = 24 linkage groups. In contrast to this, human females have only 23 linkage groups because in females 23rd pair of chromosome is XX in which both the X chromosomes are alike so it does not lead to an increase in linkage groups.

Neurospora crassa has 7 haploid chromosomes so the type of chromosomes and total number of chromosomes both are 7. Since type of chromosomes are 7, the linkage groups will also be 7 in this organism.

3 0
4 years ago
Question 6 of 10
WITCHER [35]

Answer: A, C, D

Explanation:

Give brainliest please!

5 0
3 years ago
A baby carriage is sitting at the top of a 21 m high hill. It weighs 12 N. It has ________________ energy?
Andre45 [30]

Answer:

B- Potential

Explanation:

The object has the potential energy to be converted to kinetic energy if it starts to roll down the hill. But right now it has the potential for energy.

6 0
2 years ago
how rare is gray/mostly light blue eyes and pitch-black hair/dark brown almost black hair? Please give detail on how and why? Wi
uysha [10]
It's not that common actually quite rare because gray eyes are less than 1 percent of the earth population. Being that blue eyes and black hair is considered genetically impossible gray eyes are lighter, which makes it even more most likely impossible.  
Fun fact: 10,000 years ago blue eyes didn't exist they are a mutation and everyone with blue eyes is technically related.
8 0
3 years ago
Your Rube Goldberg device design either build it or draw it
TiliK225 [7]
Build not draw it !!!!
7 0
3 years ago
Read 2 more answers
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