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kati45 [8]
2 years ago
14

Sara just found out that her sister conceived about seven days ago. She rushes to find a book on pregnancy so that she can learn

more about it. The book says that around the seventh day of pregnancy the cells of the zygote begin to:
Biology
1 answer:
vazorg [7]2 years ago
5 0

Answer:

differentiate and/or the embryo has doubled its size. Aging results in a gradual decline in female fertility.

Explanation:

Hope this was helpful

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Answer:

I believe it would be the one orbiting above the atmosphere or on Venus

Explanation:

There are no artificial/man-made interferences and being outside of the Earth's atmosphere more starlight can reach the observatory.

3 0
2 years ago
Suppose we were successful in identifying 12 mutants using a screen for identifying conditional mutants of S. cerevisiae in whic
Marina CMI [18]

Answer:

Each mutant would be mated to wild type and to every other mutant to create diploid strains. The diploids would be assayed for growth at permissive and restrictive temperature. Diploids formed by mating a mutant to a wild type that can grow at restrictive temperatures identify the mutation as recessive. Only recessive mutations can be studied using complementation analysis. Diploids formed by mating two recessive mutants identify mutations in the same gene if the diploid cannot grow at restrictive temperature (non-complementation), and they identify mutations in different genes if the diploids can grow at restrictive temperature (complementation).

Explanation:

Recessive mutations are those whose phenotypic effects are only visible in homo-zygous individuals. Moreover, a complementation test is a genetic technique used to determine if two different mutations associated with a phenotype colocalize in the same <em>locus</em> (i.e., they are alleles of the same gene) or affect two different <em>loci</em>.  In diploid (2n) organisms, this test is performed by crossing two homo-zygous recessive mutants and then observing whether offspring have the wild-type phenotype. When two different recessive mutations localize in different <em>loci</em>, they can be considered as 'complementary' since the heterozygote condition may rescue the function lost in homo-zygous recessive mutants. In consequence, when two recessive mutations are combined in the same genetic background (i.e., in the same individual) and they produce the same phenotype, it is possible to determine that both mutations are alleles of the same gene/<em>locus</em>.

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