Ravi's chromosomes are 44+xy and his wife Ratna's chromosomes are 44+xx.Then their first male child will have these chromosomes
Answers
Answer:
Explanation:
there first male child will have 44+xy chromosomes because both xx means a girl is born and xy means boys is born so.
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Answer:
Humans and chimpanzees have a different number of chromosomes. Humans have 46 while chimpanzees (and many other great apes) have 48.
Current theories say that humans and chimpanzees had a common ancestor around 6-8 million years ago. This common ancestor must have had a certain number of chromosomes.
So why don't humans and chimpanzees have the same number of chromosomes now? Because about a million years ago, in a human somewhere, two chromosomes fused. Over time, people with 46 chromosomes won out over people with 48.
A close look at human and chimpanzee DNA shows that human chromosome 2 is very similar to chromosomes 12 and 13 of chimpanzees. At some point, chromosomes 12 and 13 fused together in human ancestors to create chromosome 2. It probably happened in a similar way to what happened with the 44 chromosome man.
What scientists don't know yet is how 46 chromosomes came to win out over 48. As the 44 chromosome man shows, this sort of change starts out pretty rare. Right now having this particular set of chromosomes is probably a 1 in 7 billion sort of thing.
There are a couple of obvious ways that 46 chromosomes might take over. One is if there was some sort of advantage to having this number of chromosomes.
There is almost certainly no advantage in how the DNA is packaged. If anything, having a different number of chromosomes hurts someone in terms of having the most babies possible.
Explanation:
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