Friday
October 31, 2014

Homework Help: 7th grade science

Posted by Delilah on Wednesday, January 16, 2013 at 8:21pm.

1.
How many chromosomes do human sex cells have? (1 point)

22
43
46
23

2.
The actual genetic makeup of an organism for a particular trait is called the ______. The physical characteristic that trait gives the organisms is called the ______. (1 point)

genotype; phenotype
genome; allele
dominant; recessive
none of the above

3.

Of the following, which represents a homozygous recessive genotype?
(1 point)

TT
Tt
tt
TTT

4.
Structures in organisms that are no longer of use are called ______ structures. (1 point)

homologous
obsolete
vestigial
analogous

5.
Change in the hereditary features of a type of organism over time is ______. (1 point)

growth
biogenesis
spontaneous generation
evolution

6.
Studying the early growth and development of animals provides clues to their shared ancestry; this field of study is called ______. (1 point)

embryology
ecology
radiology
oncology

FOR #7-10: the answer choices are dominant, alleles, genetic engineering, recombinant, genes, recessive

7.
Because of ______, tomatoes can now be picked and transported great distances before they ripen. (1 point)

8.
Inserting a useful gene into the DNA of another organism is called ______ technology. (1 point)

9.
______ are different forms of a gene that codes for a certain trait. (1 point)

10.
Gregor Mendel discovered some alleles can cover up the presence of others; these alleles are called __________. (1 point)

My answers:
1. 23
2. genotype; phenotype
3. tt
4. vestigial
5. growth
6. embryology
7. genetic engineering
8. recombinant
9. alleles
10. recessive

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