4. What must be true about an index fossil whose absolute age is used as a reference for other fossils?

Biology

2 answers:

sp2606 [1]3 years ago

8 0

The correct answer is option C

Index fossil can be defined as the as the reference for the determination of the absolute age of the other fossils.

The age of index fossil can be determined by the radioactive dating or another method by which the absolute age of the index fossil can be determined.

Its age was used as reference to find the age of other fossils.

Pavel [41]3 years ago

4 0

If an index fossil whose absolute age is used as a reference for other fossils, it was determined only by radioactive dating or another absolute method.

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If a square-eyed, orange pet mates with a round-eyed, green pet, can they have any round-eyed orange

kenny6666 [7]

Yes, round-eyed orange offspring is formed because this round eyed feature is present in one of the mating organisms.

<h3>Can offspring of round-eyed orange produced?</h3>

If a square-eyed, orange pet mates with a round-eyed, green pet, they can also have round-eyed orange offspring because this round eyed feature is present in one of the mating organisms.

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A color-blind (X-linked recessive) human with Klinefelter syndrome has parents both of whom have normal color vision. 4a. From w

sineoko [7]

The extra X chromosome is received from mother.

<h3><u>Explanation</u>:</h3>

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Here both the parents are normal in terms of colour vision. So the father cannot have the gene of colour blindness because if it was present, then father would have been colour blind because he has only one X chromosome per cell. So its present in mother who is heterozygous in terms of colour blind gene. So the extra X chromosome also came from her which made the presence of two defective X chromosomes in the offspring and made it colour blind.