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34kurt
3 years ago
11

Why is the term cell theory appropriate?

Biology
1 answer:
insens350 [35]3 years ago
7 0
A basic tenet of modern biology, first stated by Matthias Schleiden and Theodor Schwann in 1838–39, that cells<span> are the basic units of structure and function in living organisms. ... A </span>theory<span> of heredity must be reconciled with the </span>cell theory<span>.</span>
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For a mutation to be passed to offspring, in what type of cell must it occur?
AVprozaik [17]

Answer:

Germ Cell DNA.

Explanation:

Mutations are only passed on to offspring when they occur in germ cell DNA, which are the cells that create sperm or ova.

mutations only occur in germ cells and their DNA.

4 0
3 years ago
Jill is heterozygous for gene A and is going to have a child with Jack, who is homozygous recessive for gene A. Which of the fol
Igoryamba

Answer:

D. Aa

Explanation:

Given:

Jill (mother) is heterozygous for gene A --------- i.e Jill = Aa

Jack (father) who is homozygous recessive for gene A-------- i.e Jack = aa

Now if both cross and fertilization occurs, we have:

         A          a

a        Aa        aa

a        Aa        aa

The offsprings are (Aa, Aa, aa, aa)

Nondsijunction is the inability of homologous chromosomes to seperate properly during cell division. Now, we were told that this fertilization undergone nondisjunction in meiosis 1. Hence, both homologous chromosome move into the same daughter cells instead of different daughter cells because separation of homologous chromosome does not occur properly.

Therefore the result of these fertilization of a normal haploid sperm with an egg that had undergone nondisjunction in meiosis yields offspring with genotype Aa of their Mother (Jill).

4 0
4 years ago
Healthy blood vessels do what more easily?
ryzh [129]
Reduce your risk of heart failure or also known as heart attack :)) -litliam✨
5 0
3 years ago
A species of salamander has two tail length phenotypes. Short tails are completely dominant over long tails. A scientists crosse
goldfiish [28.3K]

Answer:

D. If all of the offspring are short-tailed, the unknown individual is the homozygous dominant genotype.

Explanation:

The short tail phenotype is completely dominant over the long tail phenotype. When a short tailed salamander with unknown genotype is crossed with a homozygous recessive long tailed salamander, the cross is called testcross. Lets assume that the allele "S" gives "short tail" phenotype while the allele "s" gives "long tail" phenotype.

If the "short tailed salamander" with unknown genotype is homozygous dominant (SS), the process of the testcross will express only dominant trait (cross 1). On the other hand, if the "short tailed salamander" with unknown genotype is heterozygous dominant (Ss), segregation of alleles during gamete formation would form two types of gametes (cross 2). The 50% progeny would express the "long tail" phenotype while rest 50% will express the "short tail" phenotype.

8 0
3 years ago
(blank) occurs due to a genetic mutation in the hemoglobin gene resulting in poor oxygen supply. the patient requires frequent b
Elan Coil [88]

Beta thalassemia is a blood disorder that reduces the production of hemoglobin

7 0
3 years ago
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